The number of ways of selecting two having common side in a chess board is

Number of ways of selecting two squares having common side in a chess board is (1 unit size squares)

Number of ways of selecting two squares having common side in a chess board is (1 unit size squares)

Find the number of ways of selecting pair of black squares in chessboard such that they have exactly one common corner

Find the number of ways in which we can choose 3 squares on a chess board such that one of the squares has its two sides common to other two squares.

Find the number of ways in which we can choose 3 squares on a chess board such that one of the squares has its two sides common to other two squares.

Find the number of ways in which we can choose 3 squares on a chess board such that one of the squares has its two sides common to other two squares.

Find the number of ways in which we can choose 3 squares on a chess board such that one of the squares has its two sides common to other two squares.

Number of unit squares in a chess board is

The number of rectangles formed in a chess board is