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Let a and b be the roots of equation p x...

Let a and b be the roots of equation `p x^2+q x+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 (1) `(sqrt(61))/9` (2) `(2sqrt(17))/9` (3) `(sqrt(34))/9` (4) `(2sqrt(13))/9`

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