Mark the correct alternative in each of the following: If the sum of first two terms of an infin...

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Mark the correct alternative in each of the following:
If the sum of first two terms of an infinite GP is 1 and every term is twice the sum of all the successive terms, then its first term is
(A) \( 1 / 3 \)
(B) \( 2 / 3 \)
(C) \( 1 / 4 \)
(D) \( 3 / 4 \)
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