A 6abc
B Abc
C 3abc
D 9abc
Correct Answer: Option C
a + b + c = 0
=> a+b = -c
=> (a+b)3 = (-c)3
=> a3 + b3 + 3ab(a+b) = -c3
=> a3 + b3 + 3ab(-c) = -c3
=> a3 + b3 - 3abc = -c3
a3 + b3 + c3 = 3abc
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