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Determine the coefficient of x^4 in the ...

Determine the coefficient of `x^4` in the expansion of `(1+x+x^2+x^3)^n`.

A

`^nC_4`

B

`^nC_4+`^nC_2`

C

`^nC_4+`^nC_2+`^nC_4.`^nC_2`

D

`^nC_4+`^nC_2+`^nC_1.`^nC_2`

Text Solution

Verified by Experts

The correct Answer is:
D
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