Here are some cool brain benders!
27 May 2007
(z-d)X(y-d)X(x-d)...(b-d)X(a-d)=?
Answer:0
As you go from (z-d)X(y-d)X(x-d)X(w-d), sooner or later you will reach (d-d). No matter what number d is, d-d has to be 0. Anything multiplied by 0 is 0, so the answer for the whole equation is 0!