Quick one.

(x-a)(x-b)(x-c)....(x-z) = ? (Sorry, supposed to add on previous post)

The answer: 0

Solution:

(x-a)(x-b)(x-c)...(x-x)...(x-z), each letter represents a constant. Therefore, (x-x) = 0. Anything multiplied by 0 equals to 0.

Aye? Now let's hear you say the 15th letter of the alphabet nice and slow.

Ooooooo.....

(: