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If x ^(2) - hx - 21 =0, x ^(2) - 3 hx + ...

If `x ^(2) - hx - 21 =0, x ^(2) - 3 hx + 35 =0 (h gt 0)` has a common root, then the value of h is equal to

A

1

B

2

C

3

D

4

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