Sum of first five multiples of 3 is ....................... .

Q.1 (A)(iv) Sum of first five multiples of 3 is ....................... .

A. 45

B. 55

C. 15

D. 75

Doubtly Asked 25 Oct 2026 ssc 10th Save WhatsApp Report

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Answer: A. 45

Answer: (A) 45

The first five multiples of 3 are 3, 6, 9, 12, 15. Sum \(= 3 + 6 + 9 + 12 + 15 = 45\).

(A.P. with \(a = 3\), \(d = 3\), \(n = 5\): \(S_5 = \dfrac{5}{2}[2(3) + 4(3)] = \dfrac{5}{2}(18) = 45\).)

Doubtly AI · 25 Oct 2026 AI-verified · Oct 2026 Report

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