Mark the correct alternative in each of the following: The \( n \)th term of a G.P. is 128 and t...

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Mark the correct alternative in each of the following:
The \( n \)th term of a G.P. is 128 and the sum of its \( n \) terms is 225 . If its common ratio is 2 , then its first term is
(A) 1
(B) 3
(C) 8
(D) none of these
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