The fourth term of a geometric sequence is 2 and the sixt...
The fourth term of a geometric sequence is 2 and the sixth term is 8. Find the common ratio.
±1
±2
±3
±4
Correct answer is B
Tn=arn−1 (Exponential sequence)
T4=ar3=2....(1)
T6=ar5=8......(2)
Divide (2) by (1),
ar5ar3=82
r2=4
r=±2
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