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Example 7 Find Coefficient Of X6y3 In Expansion X 2y 9 Insert x n1 y next to the second number of Pascal's Triangle and add a "" sign 1x 5 5 x 4 y 10 10 5 1 ;Answer (1 of 2) I'd write down the coefficients you need in the binomial expansion by writing down the Pascal triangle numbers until you get to the 7th row 1 1 2 1 2 1 3 1 3 3 1 4 1 4 6 4 1 5 1 5 10 10 5 1 6 1 6 15 15 6 1 7 1 7 21 35 35 21 7 1 So the binomial expansion of (uv) Expand (2x+y+3z)2