Coeffecient of \( x^{p} y^{q} z^{r} \) in the expansion of \( (x+y+z)^{p+q+r} \) equal to.
(a) \...
Coeffecient of \( x^{p} y^{q} z^{r} \) in the expansion of \( (x+y+z)^{p+q+r} \) equal to.
(a) \( (p+q+r) \) !
(b) \( \frac{(p+q-r) !}{p ! q ! r !} \)
(c) \( \frac{2(p+q+r) !}{p ! q ! r !} \)
(d) \( \frac{(p+q+r) !}{p ! q ! r !} \)
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