a+b+c = 9

a^2 + b^2 +c^2 = 29

a^3 + b^3 +c^3 = 99

Determine a, b, c. Prove your answer, because the answer is very obvious.

4,-6,9
3,-2,1
2,3,4
-1,-2,-3

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substituting the choices given to the problem

2+3+4=9

4+9+16=29

8+27+64+99