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

A

`10!`

B

`(10!)/(4!8!9!9!)`

C

2520

D

Nono of these

Text Solution

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The correct Answer is:
c
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