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Let `alpha` and `beta` are roots of the equation `px^2+qx-r=0` where `pne0`. If p, q, r are the consecutive term of non-constant G.P and `1/alpha+1/beta=3/4`, then value of `(alpha-beta)^2` is:

A

9

B

`20/3`

C

8

D

`80/9`

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