Question

Write a recursive formula for the sequence {an} = (15, 26, 48,92,180…}.

Answer 1

You have the following sequence:

an = {15, 26, 48, 92, 180, ...}

the following recursive formula:

$a_n=4+11\cdot2^{n-1}$

with a1 = 15, can represent the given sequence. If you replace the different values of an for the first five elements of the sequence, you obtain the given sequence.

Then, the answer is option C.