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  1. If x = y + z then x³ – y³ – z³ is
    1. 0
    2. 3xyz
    3. –3xyz
    4. 1
Correct Option: B

x = y + z ⇒ x – y – z = 0
If a + b + c = 0 then a³ + b³ + c³ = 3abc
∴ (x)³ + (–y)³ + (–z)³ = 3x (–y) (–z) = 3xyz


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