Mark the correct alternative in each of the following: The coefficient of \( x^{8} y^{10} \) in ...

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Mark the correct alternative in each of the following:
The coefficient of \( x^{8} y^{10} \) in the expansion of \( (x+y)^{18} \) is
(A) \( { }^{18} C_{8} \)
(B) \( { }^{18} P_{10} \)
(C) \( 2^{18} \)
(D) none of these
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