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  • APGP.dvi

    https://www.sheffield.ac.uk/media/30744/download?attachment
    This is anarithmetic series, and we can find its sum by using a trick. ... What weget is. Sn. = a ar ar2 ar3. arn1 ,. and this is called a geometric series. Now the trick here to find the sum is to multiply by r andthen subtract:.