Question

What is the common ratio, r, for the sequence represented by the formula an = 3(2)^-n?


1/2
2
3
6
Is it 2?

Answer 1

The nth term has 2^-n, so the ratio is 2^-1 = 1/2

Did you try listing the first few terms? That would have made it clear that 2 was not the ratio.

Answer 2

1/2