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- By: guest on 02 Jun 2017 02.09 amClearly, 5 x 2 = 10, 10 x 2 = 20, 20 x 2 = 40,.....So, the series is a G.P. in which a = 5 and r = 2.Let 1280 be the rath term of the series.Then, 5x2n-1 = 1280 2n-1 = 256 = 28 n - 1 = 8 n = 9.
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