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If the function f(x)=x^(3)-9x^(2)+24x+c ...

If the function `f(x)=x^(3)-9x^(2)+24x+c` has three real and distinct roots `alpha, beta and gamma`, then the value of `[alpha]+[beta]+[gamma]` is

A

5, 6 ,7

B

6, 7 ,8

C

7, 8 ,9

D

None of these

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