Question

Evaluate a1 (r)^n-1 for a1 = 2, r= 3, and n = 4. A. 216 B. 18 C. 32 D. 54

Answer 1

Option D

$a1(r) {}^{n - 1}$

Putting values:

$2(3) {}^{4 - 1}$

$2(3) {}^{3}$

$2 \times 27$

$= 54$

Hence, Proved.