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20 May, 21:53

Determine if the series 7+28+112+448 has a sum

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  1. 20 May, 22:07
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    S4=a1 - a4 r / 1-r

    =7 - 448*4 / 1-4

    =7 - 1792 / - 3

    =-1785/-3

    =595
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