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How many terms of G.P.3, 3^2, 3^3,3^4,……………… are needed to give the sun 120?

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How many terms of G.P.3, 32 , 33 ,34 ,……………… are needed to give the sun 120?

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Given G.P. is 3, 32, 33, ......

∴ 4 terms are needed to give the sum 120.

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