Question: 5. How many rectangles are on a m x n-size chessboard? For example, there are nine rectangles on a 2 x 2-size board: The

5. How many rectangles are on a m x n-size " chessboard"? For example, there are nine rectangles on a 2 x 2-size board: The whole board, 4 smaller squares and 4 ways in which 2 squares make a rectangle. Check your answer by calculating the number of rectangles on a 3 x 3-size chess board

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