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NDA2011MathematicsPermutation and CombinationActual

What is the number of ordered pairs of non-zero positive integers (x, y) such that x+y 4 ?

Options

  1. A4
  2. B5
  3. C6
  4. D8

Correct answer

C. 6

Step-by-step solution

The correct answer is option (C).

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