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

If `x^(m)` occurs in the expansion of `(x+ (1)/(x^(2)))^(2n)`, then the coefficient of `x^(m)` is
a`((2n)!)/((m)!(2n-m)!)`
b. `((2n)!3!3!)/((2n-m)!)`
c. `((2n)!)/(((2n-m)/3)!((4n+m)/3)!)`
d. none of these

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