Exams › SSC CGL (Prelims) › General

Evaluate: 21^3 + 22^3 - 43^3 + 150.

1. -59448
2. -60000
3. 0
4. 1

Correct answer: -59448

Solution

Since 21 + 22 = 43, use a^3 + b^3 - (a+b)^3 = -3ab(a+b) = -3*21*22*43 = -59598. Adding 150 gives -59448.

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