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| A box containing a set of cubes to represent the formula (a+b+c)3 The lid of the box is printed to denote the colour codes (red, blue, yellow and black) at the appropriate positions. The box is hinged at two of the sides so that the two sides can be opened to facilitate easy removal of the cubes. a3 + b3 + c3 + 3a2b + 3ab2+ 3a2c + 3ac2+ 3b2c + 3bc2 |
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