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[" Let "alpha" and "beta" be the roots of equation "px^(2)+qx+r=0,p!=0." If "p,q," rare in "A.P.],[(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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