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Consider three quadratic equations, x^...

Consider three quadratic equations, `x^2-2r p_r x+r=0; r=1,2,3,` Given that each pair has exactly one root common. The common root between the equations obtained by `r=1a n dr=3` is
(a) `-sqrt(3/2)` or `sqrt(3/2)` (b) `-sqrt(2/3)` or `sqrt(2/3)` (c) `-sqrt(6)` or `sqrt(6)` (d) 1

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