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If a,b are roots of x^2+px+q=0 and c,d a...

If `a,b` are roots of `x^2+px+q=0 and c,d` are the roots `x^2-px+r=0 then a^2+b^2+c^2+d^2` equals (A) `p^2-q-r` (B) `p^2+q+r` (C) `p^2+q^2-r^2` (D) `2(p^2-q+r)`

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