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  1. If a = 1.21, b = 2.12 and c = –3.33, then the value of a3 - b3 - c3 – 3abc is
    1. 0
    2. 1
    3. 2
    4. 3
Correct Option: A

Using Rule 21,
Here, a + b + c = 1.21 + 2.12 – 3.33 = 0
a3 - b3 - c3 - 3abc = 0 ( ∴ a + b + c = 0)


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