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If p ,q ,r are positive and are in A.P....

If `p ,q ,r` are positive and are in A.P., the roots of quadratic equation `p x^2+q x+r=0` are all real for a.`|r/p-7|geq4sqrt(3)` b. `|p/r-7|geq4sqrt(3)` c. all p and r d. no p and r

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