Question

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

Answer 1

`54`

Explanation:

`a_1 {r}^(n - 1) \\ 2 * {3}^(4 - 1) \\ 2 * {3}^(3) \\ 2 * 3 * 3 * 3 \\ 2 * 9 * 3 \\ 18 * 3 \\ = 54`

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