Level 64 • 50/50 questions • 40 seconds per question.
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What is the sum of the first (29) natural numbers?
B. (435)
\(S_{29}=\frac{29\cdot30}{2}=435\). Divide (30) by (2) first.
The correct answer is B. (435). \(S_{29}=\frac{29\cdot30}{2}=435\). Divide (30) by (2) first.
\(S_{29}=\frac{29\cdot30}{2}=435\)। पहले (30) को (2) से भाग दें।
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Find the sum of the first (31) natural numbers.
B. (496)
\(S_{31}=\frac{31\cdot32}{2}=496\). Halve the even number and multiply.
The correct answer is B. (496). \(S_{31}=\frac{31\cdot32}{2}=496\). Halve the even number and multiply.
\(S_{31}=\frac{31\cdot32}{2}=496\)। सम संख्या को आधा करके गुणा करें।
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What will be the value of \(1+2+3+\cdots+33\)?
C. (561)
\(S_{33}=\frac{33\cdot34}{2}=561\). The formula is the quickest method for long addition.
The correct answer is C. (561). \(S_{33}=\frac{33\cdot34}{2}=561\). The formula is the quickest method for long addition.
\(S_{33}=\frac{33\cdot34}{2}=561\)। लंबे जोड़ में सूत्र सबसे तेज तरीका है।
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Which is the sum of the first (34) natural numbers?
C. (595)
\(S_{34}=\frac{34\cdot35}{2}=595\). Take half of (34) as (17) and calculate \(17\cdot35\).
The correct answer is C. (595). \(S_{34}=\frac{34\cdot35}{2}=595\). Take half of (34) as (17) and calculate \(17\cdot35\).
\(S_{34}=\frac{34\cdot35}{2}=595\)। (34) का आधा (17) लेकर \(17\cdot35\) करें।
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How much is the sum of the first (37) natural numbers?
B. (703)
\(S_{37}=\frac{37\cdot38}{2}=703\). Halve (38) to (19) and multiply.
The correct answer is B. (703). \(S_{37}=\frac{37\cdot38}{2}=703\). Halve (38) to (19) and multiply.
\(S_{37}=\frac{37\cdot38}{2}=703\)। (38) का आधा (19) करके गुणा करें।
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What is the sum of \(1+2+3+\cdots+38\)?
A. (741)
\(S_{38}=\frac{38\cdot39}{2}=741\). Divide (38) by (2) first.
The correct answer is A. (741). \(S_{38}=\frac{38\cdot39}{2}=741\). Divide (38) by (2) first.
\(S_{38}=\frac{38\cdot39}{2}=741\)। पहले (38) को (2) से भाग दें।
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Find the sum of the first (39) natural numbers.
C. (780)
\(S_{39}=\frac{39\cdot40}{2}=780\). Take half of (40) as (20) and calculate \(39\cdot20\).
The correct answer is C. (780). \(S_{39}=\frac{39\cdot40}{2}=780\). Take half of (40) as (20) and calculate \(39\cdot20\).
\(S_{39}=\frac{39\cdot40}{2}=780\)। (40) का आधा (20) लेकर \(39\cdot20\) करें।
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What will be the sum of the first (41) natural numbers?
C. (861)
\(S_{41}=\frac{41\cdot42}{2}=861\). Divide (42) by (2) and calculate \(21\cdot41\).
The correct answer is C. (861). \(S_{41}=\frac{41\cdot42}{2}=861\). Divide (42) by (2) and calculate \(21\cdot41\).
\(S_{41}=\frac{41\cdot42}{2}=861\)। (42) को (2) से भाग देकर \(21\cdot41\) करें।
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How much is the sum of the first (42) natural numbers?
C. (903)
\(S_{42}=\frac{42\cdot43}{2}=903\). Halve (42) to (21) and multiply.
The correct answer is C. (903). \(S_{42}=\frac{42\cdot43}{2}=903\). Halve (42) to (21) and multiply.
\(S_{42}=\frac{42\cdot43}{2}=903\)। (42) का आधा (21) करके गुणा करें।
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What is the value of \(1+2+3+\cdots+43\)?
C. (946)
\(S_{43}=\frac{43\cdot44}{2}=946\). Take half of (44) as (22) and calculate \(43\cdot22\).
The correct answer is C. (946). \(S_{43}=\frac{43\cdot44}{2}=946\). Take half of (44) as (22) and calculate \(43\cdot22\).
\(S_{43}=\frac{43\cdot44}{2}=946\)। (44) का आधा (22) लेकर \(43\cdot22\) करें।
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Which is the sum of the first (44) natural numbers?
C. (990)
\(S_{44}=\frac{44\cdot45}{2}=990\). Halve (44) and calculate \(22\cdot45\).
The correct answer is C. (990). \(S_{44}=\frac{44\cdot45}{2}=990\). Halve (44) and calculate \(22\cdot45\).
\(S_{44}=\frac{44\cdot45}{2}=990\)। (44) को आधा करके \(22\cdot45\) करें।
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What is the sum of the first (46) natural numbers?
C. (1081)
\(S_{46}=\frac{46\cdot47}{2}=1081\). Take half of (46) as (23) and multiply.
The correct answer is C. (1081). \(S_{46}=\frac{46\cdot47}{2}=1081\). Take half of (46) as (23) and multiply.
\(S_{46}=\frac{46\cdot47}{2}=1081\)। (46) का आधा (23) लेकर गुणा करें।
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Find the sum of the first (47) natural numbers.
B. (1128)
\(S_{47}=\frac{47\cdot48}{2}=1128\). Take half of (48) as (24) and calculate \(47\cdot24\).
The correct answer is B. (1128). \(S_{47}=\frac{47\cdot48}{2}=1128\). Take half of (48) as (24) and calculate \(47\cdot24\).
\(S_{47}=\frac{47\cdot48}{2}=1128\)। (48) का आधा (24) लेकर \(47\cdot24\) करें।
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What will be the sum of \(1+2+3+\cdots+48\)?
B. (1176)
\(S_{48}=\frac{48\cdot49}{2}=1176\). Divide (48) by (2) and calculate \(24\cdot49\).
The correct answer is B. (1176). \(S_{48}=\frac{48\cdot49}{2}=1176\). Divide (48) by (2) and calculate \(24\cdot49\).
\(S_{48}=\frac{48\cdot49}{2}=1176\)। (48) को (2) से भाग देकर \(24\cdot49\) करें।
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How much is the sum of the first (49) natural numbers?
C. (1225)
\(S_{49}=\frac{49\cdot50}{2}=1225\). Take half of (50) as (25) and calculate \(49\cdot25\).
The correct answer is C. (1225). \(S_{49}=\frac{49\cdot50}{2}=1225\). Take half of (50) as (25) and calculate \(49\cdot25\).
\(S_{49}=\frac{49\cdot50}{2}=1225\)। (50) का आधा (25) लेकर \(49\cdot25\) करें।
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Which is the sum of the first (52) natural numbers?
C. (1378)
\(S_{52}=\frac{52\cdot53}{2}=1378\). Take half of (52) as (26) and calculate \(26\cdot53\).
The correct answer is C. (1378). \(S_{52}=\frac{52\cdot53}{2}=1378\). Take half of (52) as (26) and calculate \(26\cdot53\).
\(S_{52}=\frac{52\cdot53}{2}=1378\)। (52) का आधा (26) लेकर \(26\cdot53\) करें।
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If \(S_n=595\), what is the value of (n)?
C. (34)
\(\frac{34\cdot35}{2}=595\), so (n=34). Check the option in the formula.
The correct answer is C. (34). \(\frac{34\cdot35}{2}=595\), so (n=34). Check the option in the formula.
\(\frac{34\cdot35}{2}=595\), इसलिए (n=34)। विकल्प को सूत्र में रखकर जांचें।
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If the sum of the first (n) natural numbers is (741), what will (n) be?
C. (38)
\(\frac{38\cdot39}{2}=741\), so (n=38). In such questions, options can be checked quickly.
The correct answer is C. (38). \(\frac{38\cdot39}{2}=741\), so (n=38). In such questions, options can be checked quickly.
\(\frac{38\cdot39}{2}=741\), इसलिए (n=38)। ऐसे प्रश्नों में विकल्प जल्दी जांचे जा सकते हैं।
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If \(S_n=861\), what is the correct value of (n)?
C. (41)
\(\frac{41\cdot42}{2}=861\), so (n=41). Always verify the answer with the formula.
The correct answer is C. (41). \(\frac{41\cdot42}{2}=861\), so (n=41). Always verify the answer with the formula.
\(\frac{41\cdot42}{2}=861\), इसलिए (n=41)। उत्तर को सूत्र से अवश्य सत्यापित करें।
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If the sum of the first (n) natural numbers is (990), what is (n)?
C. (44)
\(\frac{44\cdot45}{2}=990\), so (n=44). Match the options using the formula.
The correct answer is C. (44). \(\frac{44\cdot45}{2}=990\), so (n=44). Match the options using the formula.
\(\frac{44\cdot45}{2}=990\), इसलिए (n=44)। विकल्पों को सूत्र में रखकर मिलान करें।
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If \(S_n=1128\), what will (n) be?
C. (47)
\(\frac{47\cdot48}{2}=1128\), so (n=47). Checking options is easy for finding (n).
The correct answer is C. (47). \(\frac{47\cdot48}{2}=1128\), so (n=47). Checking options is easy for finding (n).
\(\frac{47\cdot48}{2}=1128\), इसलिए (n=47)। (n) खोजने के लिए विकल्पों की जांच आसान है।
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If \(S_n=1225\), what will be the value of (n)?
C. (49)
\(\frac{49\cdot50}{2}=1225\), so (n=49). Substituting options in the formula gives the answer quickly.
The correct answer is C. (49). \(\frac{49\cdot50}{2}=1225\), so (n=49). Substituting options in the formula gives the answer quickly.
\(\frac{49\cdot50}{2}=1225\), इसलिए (n=49)। सूत्र में विकल्प रखने से उत्तर जल्दी मिलता है।
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A student added natural numbers from (1) to (29). What sum will be obtained?
C. (435)
The sum from (1) to (29) is \(S_{29}=435\). The last number is (n).
The correct answer is C. (435). The sum from (1) to (29) is \(S_{29}=435\). The last number is (n).
(1) से (29) तक का योग \(S_{29}=435\) है। अंतिम संख्या ही (n) होती है।
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In class, numbers from (1) to (31) were written and their sum was asked. What is the correct answer?
B. (496)
\(S_{31}=\frac{31\cdot32}{2}=496\). Take the last number (31) as (n).
The correct answer is B. (496). \(S_{31}=\frac{31\cdot32}{2}=496\). Take the last number (31) as (n).
\(S_{31}=\frac{31\cdot32}{2}=496\)। अंतिम संख्या (31) को (n) मानें।
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A list has numbers from (1) to (33). What is their sum?
C. (561)
By the formula, \(S_{33}=\frac{33\cdot34}{2}=561\). If the list starts from (1), use the natural-number sum directly.
The correct answer is C. (561). By the formula, \(S_{33}=\frac{33\cdot34}{2}=561\). If the list starts from (1), use the natural-number sum directly.
सूत्र से \(S_{33}=\frac{33\cdot34}{2}=561\)। सूची (1) से शुरू हो तो सीधे प्राकृतिक संख्या का योग लगाएं।
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A student added all numbers from (1) to (37). What will be the result?
C. (703)
The sum from (1) to (37) is \(\frac{37\cdot38}{2}=703\). Halving (38) is easy.
The correct answer is C. (703). The sum from (1) to (37) is \(\frac{37\cdot38}{2}=703\). Halving (38) is easy.
(1) से (37) तक का योग \(\frac{37\cdot38}{2}=703\) है। (38) को आधा करना आसान है।
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What is the sum of natural numbers from (1) to (42)?
C. (903)
\(S_{42}=\frac{42\cdot43}{2}=903\). Halve (42) and calculate \(21\cdot43\).
The correct answer is C. (903). \(S_{42}=\frac{42\cdot43}{2}=903\). Halve (42) and calculate \(21\cdot43\).
\(S_{42}=\frac{42\cdot43}{2}=903\)। (42) को आधा करके \(21\cdot43\) करें।
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In an exercise, \(1+2+3+\cdots+46\) is to be found. What is the correct value?
C. (1081)
\(S_{46}=\frac{46\cdot47}{2}=1081\). If the addition is long, use the formula.
The correct answer is C. (1081). \(S_{46}=\frac{46\cdot47}{2}=1081\). If the addition is long, use the formula.
\(S_{46}=\frac{46\cdot47}{2}=1081\)। जोड़ लंबा हो तो सूत्र उपयोग करें।
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Find the sum of the first (54) natural numbers.
C. (1485)
\(S_{54}=\frac{54\cdot55}{2}=1485\). Take half of (54) as (27) and calculate \(27\cdot55\).
The correct answer is C. (1485). \(S_{54}=\frac{54\cdot55}{2}=1485\). Take half of (54) as (27) and calculate \(27\cdot55\).
\(S_{54}=\frac{54\cdot55}{2}=1485\)। (54) का आधा (27) लेकर \(27\cdot55\) करें।
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How much is the sum of the first (58) natural numbers?
C. (1711)
\(S_{58}=\frac{58\cdot59}{2}=1711\). Divide (58) by (2) and calculate \(29\cdot59\).
The correct answer is C. (1711). \(S_{58}=\frac{58\cdot59}{2}=1711\). Divide (58) by (2) and calculate \(29\cdot59\).
\(S_{58}=\frac{58\cdot59}{2}=1711\)। (58) को (2) से भाग देकर \(29\cdot59\) करें।
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What will be the sum of the first (65) natural numbers?
C. (2145)
\(S_{65}=\frac{65\cdot66}{2}=2145\). Take half of (66) as (33) and calculate \(65\cdot33\).
The correct answer is C. (2145). \(S_{65}=\frac{65\cdot66}{2}=2145\). Take half of (66) as (33) and calculate \(65\cdot33\).
\(S_{65}=\frac{65\cdot66}{2}=2145\)। (66) का आधा (33) लेकर \(65\cdot33\) करें।
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Which is the sum of the first (70) natural numbers?
C. (2485)
\(S_{70}=\frac{70\cdot71}{2}=2485\). Take half of (70) as (35) and multiply.
The correct answer is C. (2485). \(S_{70}=\frac{70\cdot71}{2}=2485\). Take half of (70) as (35) and multiply.
\(S_{70}=\frac{70\cdot71}{2}=2485\)। (70) का आधा (35) लेकर गुणा करें।
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What is the value of \(1+2+3+\cdots+80\)?
C. (3240)
\(S_{80}=\frac{80\cdot81}{2}=3240\). Take half of (80) as (40) and calculate \(40\cdot81\).
The correct answer is C. (3240). \(S_{80}=\frac{80\cdot81}{2}=3240\). Take half of (80) as (40) and calculate \(40\cdot81\).
\(S_{80}=\frac{80\cdot81}{2}=3240\)। (80) का आधा (40) लेकर \(40\cdot81\) करें।
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How much is the sum of the first (90) natural numbers?
C. (4095)
\(S_{90}=\frac{90\cdot91}{2}=4095\). Halve (90) and calculate \(45\cdot91\).
The correct answer is C. (4095). \(S_{90}=\frac{90\cdot91}{2}=4095\). Halve (90) and calculate \(45\cdot91\).
\(S_{90}=\frac{90\cdot91}{2}=4095\)। (90) को आधा करके \(45\cdot91\) करें।
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If \(S_n=1485\), what is the value of (n)?
C. (54)
\(\frac{54\cdot55}{2}=1485\), so (n=54). Match the options by putting them in the formula.
The correct answer is C. (54). \(\frac{54\cdot55}{2}=1485\), so (n=54). Match the options by putting them in the formula.
\(\frac{54\cdot55}{2}=1485\), इसलिए (n=54)। विकल्पों को सूत्र में रखकर मिलाएं।
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If the sum of the first (n) natural numbers is (2145), what is (n)?
C. (65)
\(\frac{65\cdot66}{2}=2145\), so (n=65). Verify the correct option using the formula.
The correct answer is C. (65). \(\frac{65\cdot66}{2}=2145\), so (n=65). Verify the correct option using the formula.
\(\frac{65\cdot66}{2}=2145\), इसलिए (n=65)। सही विकल्प को सूत्र से सत्यापित करें।
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If \(S_n=3240\), how much is (n)?
C. (80)
\(\frac{80\cdot81}{2}=3240\), so (n=80). In such questions, checking options is simple.
The correct answer is C. (80). \(\frac{80\cdot81}{2}=3240\), so (n=80). In such questions, checking options is simple.
\(\frac{80\cdot81}{2}=3240\), इसलिए (n=80)। ऐसे प्रश्नों में विकल्प जांचना सरल रहता है।
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If \(S_n=4095\), what is the correct value of (n)?
C. (90)
\(\frac{90\cdot91}{2}=4095\), so (n=90). Check the answer once with the formula.
The correct answer is C. (90). \(\frac{90\cdot91}{2}=4095\), so (n=90). Check the answer once with the formula.
\(\frac{90\cdot91}{2}=4095\), इसलिए (n=90)। उत्तर को सूत्र से एक बार जरूर जांचें।
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A child found the sum of natural numbers from (1) to (54). What is the correct sum?
C. (1485)
The sum from (1) to (54) is \(S_{54}=1485\). Take the last number as (n) and apply the formula.
The correct answer is C. (1485). The sum from (1) to (54) is \(S_{54}=1485\). Take the last number as (n) and apply the formula.
(1) से (54) तक का योग \(S_{54}=1485\) है। अंतिम संख्या को (n) मानकर सूत्र लगाएं।
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A table contains numbers from (1) to (58). What is their sum?
C. (1711)
\(S_{58}=\frac{58\cdot59}{2}=1711\). For a list starting from (1), use the natural-number sum formula.
The correct answer is C. (1711). \(S_{58}=\frac{58\cdot59}{2}=1711\). For a list starting from (1), use the natural-number sum formula.
\(S_{58}=\frac{58\cdot59}{2}=1711\)। (1) से शुरू होने वाली सूची में प्राकृतिक संख्या योग सूत्र लगाएं।
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What will be the total sum of numbers from (1) to (65)?
C. (2145)
\(S_{65}=\frac{65\cdot66}{2}=2145\). Take half of (66) as (33) and multiply.
The correct answer is C. (2145). \(S_{65}=\frac{65\cdot66}{2}=2145\). Take half of (66) as (33) and multiply.
\(S_{65}=\frac{65\cdot66}{2}=2145\)। (66) का आधा (33) लेकर गुणा करें।
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A workbook asks \(1+2+3+\cdots+70\). What is the answer?
C. (2485)
\(S_{70}=\frac{70\cdot71}{2}=2485\). The formula solves large sums quickly.
The correct answer is C. (2485). \(S_{70}=\frac{70\cdot71}{2}=2485\). The formula solves large sums quickly.
\(S_{70}=\frac{70\cdot71}{2}=2485\)। सूत्र से बड़ा जोड़ जल्दी हल होता है।
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In a question, natural numbers from (1) to (80) are to be added. What is the correct sum?
C. (3240)
The sum from (1) to (80) is \(S_{80}=3240\). Take the last number (80) as (n).
The correct answer is C. (3240). The sum from (1) to (80) is \(S_{80}=3240\). Take the last number (80) as (n).
(1) से (80) तक का योग \(S_{80}=3240\) है। अंतिम संख्या (80) को (n) मानें।
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Find the sum of the first (72) natural numbers.
C. (2628)
\(S_{72}=\frac{72\cdot73}{2}=2628\). Take half of (72) as (36) and calculate \(36\cdot73\).
The correct answer is C. (2628). \(S_{72}=\frac{72\cdot73}{2}=2628\). Take half of (72) as (36) and calculate \(36\cdot73\).
\(S_{72}=\frac{72\cdot73}{2}=2628\)। (72) का आधा (36) लेकर \(36\cdot73\) करें।
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How much is the sum of the first (85) natural numbers?
C. (3655)
\(S_{85}=\frac{85\cdot86}{2}=3655\). Take half of (86) as (43) and calculate \(85\cdot43\).
The correct answer is C. (3655). \(S_{85}=\frac{85\cdot86}{2}=3655\). Take half of (86) as (43) and calculate \(85\cdot43\).
\(S_{85}=\frac{85\cdot86}{2}=3655\)। (86) का आधा (43) लेकर \(85\cdot43\) करें।
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If \(S_n=2628\), what is the value of (n)?
C. (72)
\(\frac{72\cdot73}{2}=2628\), so (n=72). Match the options by putting them in the formula.
The correct answer is C. (72). \(\frac{72\cdot73}{2}=2628\), so (n=72). Match the options by putting them in the formula.
\(\frac{72\cdot73}{2}=2628\), इसलिए (n=72)। विकल्पों को सूत्र में रखकर मिलान करें।
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If \(S_n=3655\), what will (n) be?
C. (85)
\(\frac{85\cdot86}{2}=3655\), so (n=85). Use the formula to get the correct (n).
The correct answer is C. (85). \(\frac{85\cdot86}{2}=3655\), so (n=85). Use the formula to get the correct (n).
\(\frac{85\cdot86}{2}=3655\), इसलिए (n=85)। सही (n) पाने के लिए सूत्र का उपयोग करें।
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What will be the sum of the first (95) natural numbers?
C. (4560)
\(S_{95}=\frac{95\cdot96}{2}=4560\). Take half of (96) as (48) and calculate \(95\cdot48\).
The correct answer is C. (4560). \(S_{95}=\frac{95\cdot96}{2}=4560\). Take half of (96) as (48) and calculate \(95\cdot48\).
\(S_{95}=\frac{95\cdot96}{2}=4560\)। (96) का आधा (48) लेकर \(95\cdot48\) करें।
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If \(S_n=4560\), what is the correct value of (n)?
C. (95)
\(\frac{95\cdot96}{2}=4560\), so (n=95). Check the answer by substituting options in the formula.
The correct answer is C. (95). \(\frac{95\cdot96}{2}=4560\), so (n=95). Check the answer by substituting options in the formula.
\(\frac{95\cdot96}{2}=4560\), इसलिए (n=95)। सूत्र में विकल्प रखकर उत्तर जांचें।
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An exam asked the value of \(1+2+3+\cdots+95\). What is the correct answer?
C. (4560)
\(S_{95}=\frac{95\cdot96}{2}=4560\). In exams, apply the formula quickly for large sums.
The correct answer is C. (4560). \(S_{95}=\frac{95\cdot96}{2}=4560\). In exams, apply the formula quickly for large sums.
\(S_{95}=\frac{95\cdot96}{2}=4560\)। परीक्षा में बड़े योग के लिए सूत्र तुरंत लगाएं।
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