Exams › SSC CGL (Prelims) › General

Given p = 8.15, q = 9.06, and r = -17.21, evaluate: p^3 + q^3 + r^3 - 3pqr.

1. -3.81
2. -5.62
3. 4.75
4. 0

Correct answer: 0

Solution

p + q + r = 8.15 + 9.06 + (-17.21) = 0. Using the identity: if p+q+r=0, then p^3+q^3+r^3 = 3pqr, so p^3+q^3+r^3-3pqr = 0.

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