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  • Arithmetic Progression Basics
  • The sum of first five multiples of 3 is:
Multiple choice

The sum of first five multiples of 3 is:

  1. 45

  2. 65

  3. 75

  4. 90

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

3: (a) 45[Soln: Sn = [2a + (n - 1)d]× n/2⇒ S5 = [2×3 + (5 - 1)3)]× 5/2⇒ S5 = [6 + 12] × 5/2 = 18 × 5/2 = 9 × 5 = 45

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