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In the expansion of ((1)/(x^(2))-x^(3))^...

In the expansion of `((1)/(x^(2))-x^(3))^(n) n in N,` if the sum of the coefficients of `x^(5) and x^(10)` is 0, then n is :

A

A) 25

B

B) 20

C

C) 15

D

D) None of these

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The correct Answer is:
C
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