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  1. If x = y = 333 and z = 334, then the value of x3 + y3 + z3 – 3xyz is
    1. 0
    2. 667
    3. 1000
    4. 2334
Correct Option: C

Using Rule 22,

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

Here , x = y = 333 and z = 334
⇒ x3 + y3 + z3 - 3xyz =
1
(333 + 334 + 334)[ 02 + (-1)2 + 12 ]
2

⇒ x3 + y3 + z3 - 3xyz =
1
× 1000[ 0 + 1 + 1 ] = 1000
2



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