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.
13
12
2
3
Correct answer is B
Tn=arn−1
T4=ar4−1=ar3=192
T9=ar9−1=ar8=6
Dividing T9 by T4,
r8−3=6192
r5=132=(12)5
r=12
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