What is the sum of the first 14 terms of an arithmetic progression if the first term is -21 and last term is 40?
First term of AP = a = - 21 & last term = l = 40 Number of terms = n = 14 Sum of AP = n/2 (a + l) Â = 14/2 (- 21 + 40) => 19 x 7 = 133
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