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NDA 2025 · PYQ · Permutations and Combinations · easy

What is the number of positive integer solutions of x + y + z = 5?

  1. A.3
  2. B.5
  3. C.6✓ Correct
  4. D.9

Explanation

Number of positive integer solutions of x + y + z = n is C(n-1, 2). For n = 5: C(4, 2) = 6.
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