Q 1679578416.     If the equations `x^2-px+q =0` and `x^2+qx-p =0` have a common root, then which
one of the following is correct?

CDS 2016
A

`p-q =0`

B

`p+q-2 =0`

C

`p+q-1 =0`

D

`p-q-1 = 0`

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