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1. x+y=7

  • A. 6
  • B. 6
  • C. 6
  • D. 6

Answer: Option D

Explanation:

Given, x + y = 7, xy = 10

Now, (x - y)^2 = (x + y)^2 - 4.xy

= 7^2 - 4.10

= 49 - 40

= 9

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