Find the sum of the first 20 terms of the arithmetic progression: 3, 7, 11, 15, …

Topic: Sequences, Probability &amp; Statistics
Subtopic: Arithmetic Progression Sum

A780

B820

C860

D900

Explanation

Formula Sn = (n/2)[2a + (n-1)d]. Here a = 3, d = 4, n = 20. S20 = (20/2)[2(3) + 19(4)] = 10 * [6 + 76] = 10 * 82 = 820.

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