The positive integers x, y and z are such that x is a factor of y and y is a factor of z. Is z even?
1). xz is even
2). y is even
OA-D
1). xz is even
2). y is even
OA-D
An odd integer has all odd factors.
For Z to be odd, both x and y should be odd.
Choice 1 and choice 2 both tell us that one of them is even which debunks the the possibility of z being odd. Z will always be even.
(D)
