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| A box containing a set of 9 pieces to represent the formula (a+b+c)2 The lid of the box is printed to denote the colour codes (red, blue, yellow and black) at the appropriate positions. The box contains one red piece denoting a2, one blue piece denoting b2, one yellow piece denoting c2, 2 black pieces denoting ab. 2 black pieces denoting bc, 2 black pieces denoting ac. Hence together they make a2 + b2+ c2+ 2ab + 2ac + 2bc |
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