5. How many rectangles are on am 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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5. How many rectangles are on am 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.
Transcribed Image Text:5. How many rectangles are on am 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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