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28 October, 12:21

Find the first fourth and eighth terms of the sequence a (n) = - 2*5^n-1

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  1. 28 October, 13:33
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    A (1) = 2*5^1-1=2*5^0=2*1=2

    a (4) = 2*5^4-1=2*5^3=2*125=250

    a (8) = 2*5^8-1=2*5^7=2*78,125=156,250
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