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The first term of a GP is 1. The sum of ...

The first term of a GP is 1. The sum of 3rd and 5th term is 90. Find the common ratio of the G.P.

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If the sum of first 8 terms of an Arithmetic progression is 136 and that of first 15 terms is 465, then find the sum of first 25 terms. OR Ths sum of the 5th and 9th terms of an A.P. is 40 and the sum of the 8th and 14th term is 64. Find the sum of the first 20 terms.

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In a G.P. of even number of terms, the sum of all terms in 5 times the sum of the odd terms. The common ratio of the G.P. is :