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[" 6.If the roots of the equation "],[a(...

[" 6.If the roots of the equation "],[a(b-c)x^(2)+b(c-a)x+c(a-b)=0],[" are equal,then which one of the "],[" following is correct? "],[" (a) "a,b" and "c" are in AP "],[" (b) "a,b" and "c" are in GP "],[" (c) "a,b" and "c" are in HP "],[" (d) "a,b" and "c" do not follow any "],[" regular pattern "]

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