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  1. If x = 5, y = 6 and z = –11, then the value of x3 + y3 + z3 is
    1. –890
    2. –970
    3. –870
    4. –990
Correct Option: D

Using Rule 21,
x + y + z = 5 + 6 – 11 = 0
x3 + y3 + z3 = = 3xyz
= 3 × 5 × 6 × (–11) = –990


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