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If rational numbers a,b,c be th pth, qth...

If rational numbers a,b,c be th pth, qth, rth terms respectively of an A.P. then roots of the equation `a(q-r)x^2+b(r-p)x+c(p-q)=0` are necessarily (A) imaginary (B) rational (C) irrational (D) real and equal

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