Question

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

Answer 1

Answer:

$54$

Step-by-step explanation:

$a_1 {r}^{n - 1} \\ 2 \times {3}^{4 - 1} \\ 2 \times {3}^{3} \\ 2 \times 3 \times 3 \times 3 \\ 2 \times 9 \times 3 \\ 18 \times 3 \\ = 54$

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