evaaxhrdez evaaxhrdez

09-05-2017
Mathematics

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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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mreijepatmat mreijepatmat

14-05-2017

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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