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coefficients of x'[0 le r le (n-1)] in t...

coefficients of `x'[0 le r le (n-1)]` in the expansion of `(x+3)^(n-1)+(x+3)^(n-2) (x+2)+(x+3)^(n-3)(x+2)^(2)+….+(x+2)^(n-1)`

A

`""^(n)C_(r)(3^(r )-2^(n))`

B

`""^(n)C_(r)(3^(n-r)-2^(n-r))`

C

`""^(n)C_(r)(3^(r )+2^(n-r))`

D

None of these

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The correct Answer is:
B
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