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2 + 22 + 23 + ... + 29 = ? ?->(Show Answer!)
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1. 2 + 22 + 23 + ... + 29 = ?





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  • By: guest on 01 Jun 2017 05.46 pm
    This is a G.P. in which a = 2, r = 22 = 2 and n = 9. 2 Sn = a(rn - 1) = 2 x (29 - 1) = 2 x (512 - 1)   = 2 x 511   = 1022. (r - 1) (2 - 1)
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