SOLUTION: Determine the coefficient of x^4y^2 in the binomial expansion of (x+3y)^6

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Question 1137753: Determine the coefficient of x^4y^2 in the binomial expansion of (x+3y)^6
Answer by MathLover1(20850) About Me  (Show Source):
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=>6C2%2Ax%5E4%2A%283y%29%5E2=15x%5E4%2A9y%5E2=135x%5E4%2Ay%5E2

=> the coefficient of x%5E4y%5E2 is 135