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Assertion (A) : If alpha , beta, gamma...

Assertion (A) : If ` alpha , beta, gamma ` are the roots of ` x^3 -x-1=0` then ` alpha^3 + beta^3 + gamma^3 =1`
Reason (R ): If a +b+c=0 then ` a^3 + b^3 +c^3 = 3abc`

A

0

B

3abc

C

3(a + b+ c)

D

3(a+b)(b+c)(c+a)

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