Binomial Squares A box containing a set of 4 pieces to represent the formula (a+b)2 The lid of the box is printed to denote the colour codes (red, blue and black) at the appropriate positions. The box contains one red piece denoting a2, one blue piece denoting b2 and 2 identical black pieces each denoting ab. Hence together they make a2 + b2+ 2ab. Qty :