The sum of even numbers between 1 and 31 is
Choose the correct choice from the following:
A) 16
B) 128
C) 240
D) 512
E) none

Rationale: "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 c"
Answer: C