182
91
63
28
Correct answer is B
Tn=arn−1 (nth term of a G.P)
T4=ar3=189
7×r3=189⟹r3=27
r=3√27=3
Sn=a(rn−1)r−1
S3=7(33−1)3−1
= 7×262=91
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