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If tan alpha, tan beta, tangamma are th...

If `tan alpha, tan beta, tangamma` are the roots of the equation, `x^3- (a + 1) x^2 + (b - a) x-b= 0, (b-a !=1)` Where `alpha + beta +gamma` lies between `0 & pi` then `alpha + beta +gamma` is equal to

A

`pi//4`

B

`pi//2`

C

`3pi//4`

D

None of these

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The correct Answer is:
A
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