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Question Number 155356 by qaz last updated on 29/Sep/21

$$\mathrm{Find}\mathrm{the}\mathrm{coefficient}\mathrm{of}\mathrm{term}‘‘{\mathrm{a}}^{\mathrm{m}}{\mathrm{b}}^{2\mathrm{m}}{}^{″}\mathrm{in}{(1+\mathrm{a})}^{\mathrm{m}}{(1+\mathrm{b})}^{\mathrm{n}+\mathrm{m}}{(1+\mathrm{a}+\mathrm{b})}^{\mathrm{m}}.$$

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