Allied & ICAR Exam Bank • ALLIED_1366 MCQ • 1 Mark

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Numerical Computation

Question Statement:

The sum of the first 20 terms of the arithmetic progression 3, 7, 11, 15, ... is:

Options:

  • (A) 820
  • (B) 800
  • (C) 840
  • (D) 780

Answer Key:

A

Step-by-Step Solution & Explanation

$a = 3, d = 4, n = 20$. $S_{20} = (20/2)[2(3) + 19(4)] = 10[6 + 76] = 10 \times 82 = 820$.
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