Find the coefficient of x^2 y^3 z^4 i...

Find the coefficient of
`x^2 y^3 z^4` in the expansion of `(ax -by +cx)^9`
(b) `a^2 b^3 c^4` d in the expansion of `(a -b-c +d)^10`

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The correct Answer is:

`-1260 , a^2b^3 c^4` ; (b ) - 12600`

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