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20. If a + b + c = 15 and a2 + b2 + c2 = 83, find the value of a3 + b3 + c3 3abc. |
| Answer» 20. If a + b + c = 15 and a2 + b2 + c2 = 83, find the value of a3 + b3 + c3 3abc. | |