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If x^(r) occurs in the expansion of (x+(...

If `x^(r)` occurs in the expansion of `(x+(1)/(x))^(n)`, then is coefficient is

A

((n) !)/((r !)^(2))

B

`((n) !)/((r+1) !.(r-1) !) `

C

`((n) !)/(((n+r)/(2)) !((n-r)/(2)) !) `

D

`((n !)/((r / 2) !))^(2) `

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The correct Answer is:
C
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