SSC CHSL Tier-1 practice question
The sum of the first 20 terms of the arithmetic progression 3, 7, 11, 15, … is
From a SSC CHSL Tier-1 Quantitative Aptitude practice set · Quantitative Aptitude
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Correct answer: (C) 820
S₂₀ = (20/2)[2(3) + 19(4)] = 10 × 82 = 820. **తె:** మొత్తం 820.
हिंदी में प्रश्न
3, 7, 11, 15, … అంకశ్రేఢిలో మొదటి 20 పదాల మొత్తం?
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सही उत्तर: (C) 820
S₂₀ = (20/2)[2(3) + 19(4)] = 10 × 82 = 820। **हिंदी:** कुल योग 820।
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