1.

If the coefficient of x^(5) in the expansion of (ax^(2)+(1)/(bx))^(13) is equal to the coefficient of x^(-5) in the expansion of (ax-(1)/(bx^(2)))^(13), then ab =

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-1
`(1)/(6)`
`(7)/(6)`
`(4)/(2)`

Answer :A


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