Question

In how many ways, we can choose a black and a white square on a chess board such that the two are not in the same row or column?

Answer 1

there are total 64 Square out of which 32 white & 32 black
now first choose a white block by 32 c1 now we can not choose 8 black squares so now choose one black square out of 24 by 24 c1
thus answer is 32 c1 *24c1= 32*24=768