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Find the coefficient of x^3y^4 in the expansions of 1. (1 + x + y)^n 2. (1 + 2x+ 3y^2)^n Kindly show the full solution, please and thanks.?

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  • Find the coefficient of x^3y^4 in the expansions of 1. (1 + x + y)^n 2. (1 + 2x+ 3y^2)^n Kindly show the full solution, please and thanks.?


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