If two of the 64 squares are chosen at random on a chess board, the probability that they have a side in common is

Two squares are chosen at random on a chessboard, the probability that they have a side in common is:

Two unit squares are chosen at random on a chess board. Find the probability that they have a side in common.

Two squares are choosen at random on a chess board. Show that the probability that they have a side in common is (1)/(18).

If 4 squares are chosen at random on a chess board, the probability that they lie on a diagonal line is

If 4 squares are chosen at random on a chess board,the probability that they lie on a diagonal line is

If 7 squares are chosen at random on a chess board, the probability that they lie on a diagonal line is

Two squares are chosen at random on a chessboard (see figure). The probability that they have a side in common is :