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  1. If a = 2·361, b = 3·263 and c = 5·624, then the value of a3 - b3 - c3 + 3abc is
    1. 35·621
    2. 0
    3. 19·277
    4. 1
Correct Option: B

Using Rule 21,
a + b + (–c) = 2.361 + 3.263 – 5.624 = 0
∴ a3 + b3 + [ -c3 - 3ab(-c) ] = 0
i.e. a3 + b3 – c3 + 3abc = 0


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