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 141-150 of 600 questions.
What will be the total sum of numbers from (1) to (65)?
C. (2145)
\(S_{65}=\frac{65\cdot66}{2}=2145\)। (66) का आधा (33) लेकर गुणा करें। / \(S_{65}=\frac{65\cdot66}{2}=2145\). Take half of (66) as (33) and multiply.
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A workbook asks \(1+2+3+\cdots+70\). What is the answer?
C. (2485)
\(S_{70}=\frac{70\cdot71}{2}=2485\)। सूत्र से बड़ा जोड़ जल्दी हल होता है। / \(S_{70}=\frac{70\cdot71}{2}=2485\). The formula solves large sums quickly.
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In a question, natural numbers from (1) to (80) are to be added. What is the correct sum?
C. (3240)
(1) से (80) तक का योग \(S_{80}=3240\) है। अंतिम संख्या (80) को (n) मानें। / The sum from (1) to (80) is \(S_{80}=3240\). Take the last number (80) as (n).
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Find the sum of the first (72) natural numbers.
C. (2628)
\(S_{72}=\frac{72\cdot73}{2}=2628\)। (72) का आधा (36) लेकर \(36\cdot73\) करें। / \(S_{72}=\frac{72\cdot73}{2}=2628\). Take half of (72) as (36) and calculate \(36\cdot73\).
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How much is the sum of the first (85) natural numbers?
C. (3655)
\(S_{85}=\frac{85\cdot86}{2}=3655\)। (86) का आधा (43) लेकर \(85\cdot43\) करें। / \(S_{85}=\frac{85\cdot86}{2}=3655\). Take half of (86) as (43) and calculate \(85\cdot43\).
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If \(S_n=2628\), what is the value of (n)?
C. (72)
\(\frac{72\cdot73}{2}=2628\), इसलिए (n=72)। विकल्पों को सूत्र में रखकर मिलान करें। / \(\frac{72\cdot73}{2}=2628\), so (n=72). Match the options by putting them in the formula.
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If \(S_n=3655\), what will (n) be?
C. (85)
\(\frac{85\cdot86}{2}=3655\), इसलिए (n=85)। सही (n) पाने के लिए सूत्र का उपयोग करें। / \(\frac{85\cdot86}{2}=3655\), so (n=85). Use the formula to get the correct (n).
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What will be the sum of the first (95) natural numbers?
C. (4560)
\(S_{95}=\frac{95\cdot96}{2}=4560\)। (96) का आधा (48) लेकर \(95\cdot48\) करें। / \(S_{95}=\frac{95\cdot96}{2}=4560\). Take half of (96) as (48) and calculate \(95\cdot48\).
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If \(S_n=4560\), what is the correct value of (n)?
C. (95)
\(\frac{95\cdot96}{2}=4560\), इसलिए (n=95)। सूत्र में विकल्प रखकर उत्तर जांचें। / \(\frac{95\cdot96}{2}=4560\), so (n=95). Check the answer by substituting options in the formula.
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An exam asked the value of \(1+2+3+\cdots+95\). What is the correct answer?
C. (4560)
\(S_{95}=\frac{95\cdot96}{2}=4560\)। परीक्षा में बड़े योग के लिए सूत्र तुरंत लगाएं। / \(S_{95}=\frac{95\cdot96}{2}=4560\). In exams, apply the formula quickly for large sums.
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