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If x^2 + 2(a-1)x + a + 5 = 0 has real ro...

If `x^2 + 2(a-1)x + a + 5 = 0` has real roots belonging to the interval (2, 4), then the complete set of values of a is

A

`(-oo-(8)/(7))`

B

`(4,oo)`

C

`(-oo-(48)/(3))`

D

`ain (phi)`

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