Answers

2016-07-11T18:34:07+08:00
2,4,8,16,32

given: a1: 2
an: 32
n: 5
r:?

solution:
an=a1(r) ^ n-1
32=2(r)^5-1
32=2(r)^4
32/2=2/2(r)^4
16=r^4
4√16=4√r^4
2=r

2×2=4
4×2=8
8×2=16
16×2=32
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