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[" Hence roots of equation ( 1) are equal."],[" Ex.4.If the roots of equation "a(b-c)x^(2)+b(c-a)x+c(a-b)=0],[" be equal prove that "a,b,c" are in "H.P" ."],[" [H.S."66;P.U.63;M.64,78;R.U.64,67;" Bhag.U."70,75;" B.U."70J]

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