The sum of even numbers between 1 and 31 is: ?->(Show Answer!)

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1. The sum of even numbers between 1 and 31 is:

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By: guest on 01 Jun 2017 05.46 pm

Let Sn = (2 + 4 + 6 + ... + 30). This is an A.P. in which a = 2, d = 2 and l = 30 Let the number of terms be n. Then, a + (n - 1)d = 30 2 + (n - 1) x 2 = 30 n = 15. Sn = n (a + l) = 15 x (2 + 30) = (15 x 16) = 240. 2 2

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