If x is a sum of all even integers on the interval 13...61 and y is their number, what is the GCD (x, y)?
Choose the correct choice from the following options
A) 1	B) 13	C) 26	D) 24	E) 1014

Rationale: "x = 14 + 16 + . . . + 60 = ( largest + smallest ) / 2 * ( # of terms ) = ( 14 + 60 ) / 2 * 24 = 37 * 24 . gcd of 24 and 37 * 22 is 24 . answer : d ."
Answer: D