Let alpha and beta be the roots of equat...

Let `alpha and beta` be the roots of equation `px^2 + qx + r = 0 , p != 0`.If `p,q,r` are in A.P. and `1/alpha+1/beta=4`, then the value of `|alpha-beta|` is :

`(sqrt 34)/(9)`

`(2 sqrt13)/(9)`

`(sqrt 61)/(9)`

`(2sqrt 17)/(9)`

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