The sum of 21 + 22 + 23 + .....+ 50 is
Given:
Find the sum:
21 + 22 + 23 + ....... + 50
Formula Used:
Sum of an AP:
where
(a) = first term, (l) = last term, (n) = number of terms
Solution:
First term, a = 21
Last term, l = 50
Number of terms:
n = 50 - 21 + 1 = 30
Sum, S =
= 15 × 71 = 1065
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