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The 6th term of a G.P is 227 and its first ter...

The 6th term of a G.P is 227 and its first term is 18. What is the common ratio?

A.

-1/2

B.

-1/3

C.

1/4

D.

2

E.

3

Correct answer is B

a, ar, ar2, ar3, ar4, ar5
6th term = ar5 = 227
1st term = a = 18
=> ar5

= 18r5 =227

r5 = 22718

→ 1279


r5 = 1243


r = 5√[1243]

 

r = 13