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Question

If xy and yx are rational numbers, then which of the following options are not  correct?
  1. x0, y can be 0
  2. x can be 0, y0
  3. x0,y0
  4. both x and y can be 0


Solution

The correct options are
A x0, y can be 0
B x can be 0, y0
D both x and y can be 0
A rational number cannot have its denominator as 0. As xy and yx are rational numbers, x0,y0.

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