Question

Find the sum of the finite arithmetic sequence. Sum of the integers from −10 to 50

Solution

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n = (last term - first term) + 1 = [50(10)+1]=50+10+1=61\textsf{\color{default}$n$ = (last term - first term) + 1 = $[ 50 - (-10) + 1] = 50 + 10 + 1 = 61$}

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