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Find-the-coefficient-of-term-a-m-b-2m-in-1-a-m-1-b-n-m-1-a-b-m-




Question Number 155356 by qaz last updated on 29/Sep/21
Find the coefficient of term “ a^m b^(2m)  ” in (1+a)^m (1+b)^(n+m) (1+a+b)^m .
$$\mathrm{Find}\:\mathrm{the}\:\mathrm{coefficient}\:\mathrm{of}\:\mathrm{term}\:“\:\mathrm{a}^{\mathrm{m}} \mathrm{b}^{\mathrm{2m}} \:''\:\mathrm{in}\:\left(\mathrm{1}+\mathrm{a}\right)^{\mathrm{m}} \left(\mathrm{1}+\mathrm{b}\right)^{\mathrm{n}+\mathrm{m}} \left(\mathrm{1}+\mathrm{a}+\mathrm{b}\right)^{\mathrm{m}} . \\ $$

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