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Question 1
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If $a,b$ are the roots of $x^2+px+1=0$ and $c,d$ are the roots of $x^2+qx+1=0$, the value of $E=(a-c)(b-c)(a+d)(b+d)$ is
A.
$p^2-q^2$
B.
$q^2-p^2$
C.
$q^2+p^2$
D.
None of these
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