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The fourth term of an exponential sequence is 192 and its...

The fourth term of an exponential sequence is 192 and its ninth term is 6. Find the common ratio of the sequence.

A.

13

B.

12

C.

2

D.

3

Correct answer is B

Tn=arn1

T4=ar41=ar3=192

T9=ar91=ar8=6

Dividing T9 by T4

r83=6192

r5=132=(12)5

r=12