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  1. If a + b + c = 0, then a3 + b3 + c3 is equal to
    1. a + b + c
    2. abc
    3. 2abc
    4. 3abc
Correct Option: D

Using Rule 21,
∴ a3 + b3 + c3 – 3abc = (a + b + c)(a2 + b2 + c2 – ab – bc – ca)
If a + b + c = 0, then a3 + b3 + c3 = 3abc


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