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Find the coefficient of a^(5) b^(5)c^(5)...

Find the coefficient of `a^(5) b^(5)c^(5)d^(8)` in the expansion of the following expression. `(bcd + acd + abd+ abc)^(7)`

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RESONANCE-COMBINATORICS-Exercise-2 (Part-I: Previous Asked Question for Pre RMO)
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