If (p^2-q^2) x^2+(q^2-r^2) x+r^2-p^2=0 and (p^2. .-q^2) γ^2+(r^2-p^2) γ+q^2-r^2=0 have a common r...

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If (p^2-q^2) x^2+(q^2-r^2) x+r^2-p^2=0 and (p^2. .-q^2) γ^2+(r^2-p^2) γ+q^2-r^2=0 have a common root for all real values of p, q and r, then find the common root.
(a) -1
(b) 1
(c) 2
(d) -2

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