Q1: The difference of the squares of two consecutive even integers is divisible by which of the following integers ?
A 7
B 4
C 3
D 6
ANS:B - 4
Let the two consecutive even integers be 2n and (2n + 2). Then,
(2n + 2)2 = (2n + 2 + 2n)(2n + 2 - 2n)
= 2(4n + 2)
= 4(2n + 1), which is divisible by 4.