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22 May, 12:11

An arithmetic series has seven terms. the first term is 5 and the last term is 53. find the sum of the series!

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  1. 22 May, 12:30
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    The easiest way is to use (& to memorize) the sum formula for a AP:

    Sum = 1st term added to the last term & multiplied by half the number of terms

    S = (a+l) n/2

    S = (5 + 53) (7/2) = 203
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