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  1. If a = 4 . 36, b = 2.39 and c = 1.97, then the value of a3 - b3 - c3 – 3abc is
    1. 3.94
    2. 2.39
    3. 0
    4. 1
Correct Option: C

Using Rule 21,
Here, a – b – c = 4.36 – 2.39 – 1.97 = 0 ( ∴ a - b - c = 0)
∴ a3 - b3 - c3 = 3abc = 0
⇒ a3 - b3 - c3 - 3abc = 0


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