In the expansion of \( (x+y+z)^{25} \) P (a) every term is of the f...

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In the expansion of \( (x+y+z)^{25} \)
P
(a) every term is of the form \( { }^{25} C_{r} \cdot C_{k} \cdot x^{25-r} \cdot y^{r-k} \cdot z^{k} \) (b) the coefficient of \( x^{8} y^{9} z^{9} \) is 0
W
(c) the number of terms is 325
(d) none of these
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