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1. x+y=3

  • A. -12
  • B. -12
  • C. -12
  • D. -12

Answer: Option D

Explanation:

x^3 +y^3 + 3xy

= (x+y)^3 - 3xy(x+y) + 3xy

=(3)^3 - 3.1.3 +3.1

= 27-9+3

=21.

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