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  1. If x = 332, y = 333, z = 335, then the value of x3 + y3 + z3 – 3xyz is
    1. 10000
    2. 7000
    3. 8000
    4. 9000
Correct Option: B

Using Rule 22,
x = 332, y = 333, z = 335
∴ x + y + z = 332 + 333 + 335 = 1000

∴ x3 + y3 + z3 – 3xyz =
1
(x + y + z)[ (x - y)2 + (y - z)2 + (z - x)2 ]
2

⇒ x3 + y3 + z3 – 3xyz =
1000
[ (332 – 333)2 + (333 – 335)2 + (335 - 332)2 ]
2

⇒ x3 + y3 + z3 – 3xyz = 500 (1 + 4 + 9) = 500 × 14 = 7000



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