Practice focused topic-wise MCQs with answers and explanations for quick revision and exam preparation.
Difficulty select karke sirf is topic ke focused MCQs practice karein. Score, timer aur explanations student-friendly flow me milenge.
Showing 121-130 of 600 questions.
If \(S_n=1128\), what will (n) be?
C. (47)
\(\frac{47\cdot48}{2}=1128\), इसलिए (n=47)। (n) खोजने के लिए विकल्पों की जांच आसान है। / \(\frac{47\cdot48}{2}=1128\), so (n=47). Checking options is easy for finding (n).
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If \(S_n=1225\), what will be the value of (n)?
C. (49)
\(\frac{49\cdot50}{2}=1225\), इसलिए (n=49)। सूत्र में विकल्प रखने से उत्तर जल्दी मिलता है। / \(\frac{49\cdot50}{2}=1225\), so (n=49). Substituting options in the formula gives the answer quickly.
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A student added natural numbers from (1) to (29). What sum will be obtained?
C. (435)
(1) से (29) तक का योग \(S_{29}=435\) है। अंतिम संख्या ही (n) होती है। / The sum from (1) to (29) is \(S_{29}=435\). The last number is (n).
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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)
\(S_{31}=\frac{31\cdot32}{2}=496\)। अंतिम संख्या (31) को (n) मानें। / \(S_{31}=\frac{31\cdot32}{2}=496\). Take the last number (31) as (n).
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A list has numbers from (1) to (33). What is their sum?
C. (561)
सूत्र से \(S_{33}=\frac{33\cdot34}{2}=561\)। सूची (1) से शुरू हो तो सीधे प्राकृतिक संख्या का योग लगाएं। / By the formula, \(S_{33}=\frac{33\cdot34}{2}=561\). If the list starts from (1), use the natural-number sum directly.
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A student added all numbers from (1) to (37). What will be the result?
C. (703)
(1) से (37) तक का योग \(\frac{37\cdot38}{2}=703\) है। (38) को आधा करना आसान है। / The sum from (1) to (37) is \(\frac{37\cdot38}{2}=703\). Halving (38) is easy.
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What is the sum of natural numbers from (1) to (42)?
C. (903)
\(S_{42}=\frac{42\cdot43}{2}=903\)। (42) को आधा करके \(21\cdot43\) करें। / \(S_{42}=\frac{42\cdot43}{2}=903\). Halve (42) and calculate \(21\cdot43\).
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In an exercise, \(1+2+3+\cdots+46\) is to be found. What is the correct value?
C. (1081)
\(S_{46}=\frac{46\cdot47}{2}=1081\)। जोड़ लंबा हो तो सूत्र उपयोग करें। / \(S_{46}=\frac{46\cdot47}{2}=1081\). If the addition is long, use the formula.
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Find the sum of the first (54) natural numbers.
C. (1485)
\(S_{54}=\frac{54\cdot55}{2}=1485\)। (54) का आधा (27) लेकर \(27\cdot55\) करें। / \(S_{54}=\frac{54\cdot55}{2}=1485\). Take half of (54) as (27) and calculate \(27\cdot55\).
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How much is the sum of the first (58) natural numbers?
C. (1711)
\(S_{58}=\frac{58\cdot59}{2}=1711\)। (58) को (2) से भाग देकर \(29\cdot59\) करें। / \(S_{58}=\frac{58\cdot59}{2}=1711\). Divide (58) by (2) and calculate \(29\cdot59\).
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