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[" (c) "-1],[" 153.Let "alpha" and "beta...

[" (c) "-1],[" 153.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|],[[" (a) "(sqrt(34))/(9)," (b) "(2sqrt(13))/(9)],[" (c) "(sqrt(61))/(9)," (d) "(2sqrt(17))/(9)]]

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