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Question

The coefficient of x8y10 in the expansion of (x+y)18 is



A

18C8

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B

18P10

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C

218

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D

None of these

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Solution

The correct option is D

18C8


18C8

Suppose the (r+1)th term in the given expansion contains x8y10

Then, we have

Tr+1=18Crx18ryr

For the coefficient of x8y10 we have:

r=10

Hence, the required coefficient is 18C10or18C8


Mathematics
RD Sharma
Standard XI

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