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If the equations x^2+bx+c=0 and x^2+dx+e...

If the equations `x^2+bx+c=0` and `x^2+dx+e=0` have a common root, which of fhe dollowing can be the common root?

A

`p-q=0`

B

`p+q= -1`

C

`pq= -1`

D

pq = 0

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