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 41-50 of 600 questions.
Find the sum of the first (32) natural numbers.
C. (528)
\(S_{32}=\frac{32\cdot33}{2}=528\)। (32) का आधा (16) लेकर \(16\cdot33\) करें। / \(S_{32}=\frac{32\cdot33}{2}=528\). Take half of (32) as (16) and calculate \(16\cdot33\).
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What is the sum of the first (1) natural number?
B. (1)
पहली प्राकृतिक संख्या (1) है, इसलिए योग (1) है। प्राकृतिक संख्याएं (1) से शुरू होती हैं। / The first natural number is (1), so the sum is (1). Natural numbers start from (1).
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What is the sum of \(1+2+3+\cdots+75\)?
C. (2850)
\(S_{75}=\frac{75\cdot76}{2}=2850\)। (76) का आधा (38) लेकर \(75\cdot38\) करें। / \(S_{75}=\frac{75\cdot76}{2}=2850\). Take half of (76) as (38) and calculate \(75\cdot38\).
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If the sum of the first (n) natural numbers is (36), what is (n)?
C. (8)
\(\frac{8\cdot9}{2}=36\), इसलिए (n=8)। विकल्प को सूत्र में रखकर जल्दी जांचें। / \(\frac{8\cdot9}{2}=36\), so (n=8). Quickly check the option in the formula.
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Which is the sum of the first (23) natural numbers?
B. (276)
\(S_{23}=\frac{23\cdot24}{2}=276\)। (24) का आधा (12) लेकर \(23\cdot12\) करें। / \(S_{23}=\frac{23\cdot24}{2}=276\). Take half of (24) as (12) and calculate \(23\cdot12\).
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What is the sum of the first (27) natural numbers?
B. (378)
\(S_{27}=\frac{27\cdot28}{2}=378\)। (28) का आधा (14) लेकर \(27\cdot14\) करें। / \(S_{27}=\frac{27\cdot28}{2}=378\). Take half of (28) as (14) and calculate \(27\cdot14\).
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A teacher asked to add numbers from (1) to (15). What is the correct sum?
C. (120)
(1) से (15) तक का योग \(S_{15}=120\) है। अंतिम संख्या ही (n) होती है। / The sum from (1) to (15) is \(S_{15}=120\). The last number is (n).
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How much is the sum of the first (55) natural numbers?
A. (1540)
\(S_{55}=\frac{55\cdot56}{2}=1540\)। (56) का आधा (28) लेकर \(55\cdot28\) करें। / \(S_{55}=\frac{55\cdot56}{2}=1540\). Take half of (56) as (28) and calculate \(55\cdot28\).
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If \(S_n=91\), what is the correct value of (n)?
C. (13)
\(\frac{13\cdot14}{2}=91\), इसलिए (n=13)। उत्तर को सूत्र से अवश्य सत्यापित करें। / \(\frac{13\cdot14}{2}=91\), so (n=13). Always verify the answer with the formula.
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What will be the sum of the first (36) natural numbers?
C. (666)
\(S_{36}=\frac{36\cdot37}{2}=666\)। (36) को आधा कर \(18\cdot37\) करें। / \(S_{36}=\frac{36\cdot37}{2}=666\). Halve (36) and calculate \(18\cdot37\).
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