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1. |
If x3 + y3 + z3 = 3(1 + xyz), P = y + z – x, Q = z + x – y and R = x + y – z, then what is the value of P3 + Q3 + R3 – 3PQR? |
A. | 9 |
B. | 8 |
C. | 12 |
D. | 6 |
Answer» D. 6 | |