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The coefficient of a^8b^4c^9d^9 in (a b...

The coefficient of `a^8b^4c^9d^9` in `(a b c+a b d+a c d+b c d)^(10)` is `10 !` b. `(10 !)/(8!4!9!9!)` c. `2520` d. none of these

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