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If agt0 and coefficients of x^5 and x^(1...

If `agt0` and coefficients of `x^5` and `x^(15)` in the expansion of `(x^2+a/x^3)^(10)` are equal then a=

A

`(3)/(7)`

B

`(7)/(3)`

C

`(7)/(9)`

D

`(9)/(7)`

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