The sum of even numbers between 1 and 31 is:  Choose the correct choice from the following
A) 240
B) 789
C) 520
D) 879
E) 456
Explanation:   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   =&gt;2 + (n - 1) x 2 = 30   n = 15.   Sn =	n/2(a + l)=15/2	x(2 + 30) = (15 x 16) = 240.   240NSWER:240
<result>A</result>
The sum of even numbers between 1 and 31 is: