Question

If the first term of the arithmetic progression is 18, the common difference is 5, and the number of terms in the series are 40, then find the sum of the series.

First term a 18 Common difference d 5 Number of terms n 40 Required sum n2 2a n 1 d 402 2 18 40 1 5 20 36 39 5 20 36 195 20 231 4620

A 7732

B 5544

C 4455

D 4620

E None of these

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