The coefficient of x^3y^4z in the expans...

The coefficient of `x^3y^4z` in the expansion of `(1+x+y-z)^9` is (A) `2.^9C_7.^7C_4` (B) `-2.^9C_2 . ^7C_4` (C) `^9C_7.^7C_4` (D) none of these

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