x, y and z are real numbers . If x^(3)...

x, y and z are real numbers . If ` x^(3) + y^(3) + z^(3) = 13 , x + y +z= 1 ` and xyz = 1 then what is the value of ` xy + yz + zx ` ?

A

-1

B

1

C

3

D

-3

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Verified by Experts

The correct Answer is:

D

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