Allied & ICAR Exam Bank • ALLIED_2359 MCQ • 2 Marks

Section 8: General Aptitude

Quantitative Aptitude

Subtopic: Numerical Computation

Question Statement:

If $f(x + y) = f(x) f(y)$ for all real $x, y$ and $f(1) = 3$, the value of $\sum_{r=1}^{4} f(r)$ is:

Options:

  • (A) 120
  • (B) 81
  • (C) 108
  • (D) 121

Answer Key:

A

Step-by-Step Solution & Explanation

$f(x) = 3^x$. Sum $= 3^1 + 3^2 + 3^3 + 3^4 = 3 + 9 + 27 + 81 = 120$.
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