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

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 (a) `sqrt34/9` (b) `(2sqrt13)/9` (c) `sqrt16/9` (d) `(2sqrt17)/9`

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