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