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If a1, a2, a3(a1>0) are three successive...

If `a_1, a_2, a_3(a_1>0)` are three successive terms of a G.P. with common ratio `r ,` for which `a_3>4a_2-3a_1` holds true is given by a. `1ltrlt-3` b. `-3ltrlt-1` c. `r gt3 or rlt1` d. none of these

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