1.

If in the expansion of (x^(3)-1/(x^(2)))^(n)the sum of the coefficients of x^(5) and x^(10) is 0, then the coefficient of x^(20) is:

Answer»

`""^(20)C_(6)`
`-""^(20)C_(6)`
`""^(15)C_(5)`
`-""^(15)C_(5)`

Answer :D


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