The sum of even numbers between 1 and 31 is  Choose one.
A) 16
B) 128
C) 240
D) 512
E) None
Solution   Required numbers are 2, 4, 6,..30.   This is an A.P containing 15 terms.   Required sum	= n/2(first term + last term)   ‹=›15 / 2(2+30)   ‹=› 240.   Answer 240
<result>C</result>
The sum of even numbers between 1 and 31 is