Find the number of ways in which two small squares can be selected on the normal chessboard if they are not in same row or same column.

Find the total number of rectangles on the normal chessboard.

Find the number of ways in which 5 boys and 3 girls can be arranged in a row so that no two girls are together.

The number of ways in which 5X 's can be placed in the squares of the figure so that no row remains empty is:

Number of ways in which 3 squares of unit length can be chosen on a 8x8 chessboard,so that all squares are in same diagonal line,is

Find number of rectangles in a chessboard, which are not a square.

Find the number of ways in which six persons can be seated at a round table,so that all shall not have the same neighbours n any two arrangements.

Find the number of ways in which 5A's and 6B's can be arranged in a row which reads the same backwards and forwards.

In how many ways is it possible to choose a white square and a black square on a chess board so that the squares must not lie in the same row or column?