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If the quadratic equation ax^2 + 2cx + b...

If the quadratic equation `ax^2 + 2cx + b = 0 and ax^2 + 2bx + c = 0 (b!=c)` have a common root, then `a + 4b + 4c =`

A

`-2`

B

1

C

`-1`

D

None of these

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