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If `alpha, beta, gamma` are the roots of the equation `x^(2)=px^(2)+qx-r=0,` then the value of `sum(alphabeta)/(gamma)` is equal to

A

`pq+3r`

B

`pq+r`

C

`pq-3r`

D

`(q^(2)-2pr)/(r)`

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