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If the first term of a G.P. a1, a2, a3, ...

If the first term of a G.P. `a_1, a_2, a_3, ddot` is unity such that `4a_2+5a_3` is least then the common ratio of G.P. is `-2//5` b. `-3//` c. `//5` d. none of these

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