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  1. If x + y = 1, then the value of (x3 + y3 + 3xy) is ?
    1. -2
    2. 1
    3. 2
    4. 3
Correct Option: B

We know that algebraic formula,
(x + y)3 = x3 + y3 + 3xy (x + y)
put the value of x + y in given equation. [ given, x + y = 1]
1 = x3 + y3 + 3xy X 1
⇒ x3 + y3 + 3xy = 1


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