NDA 2025 · PYQ · Permutations and Combinations · easy
What is the number of positive integer solutions of x + y + z = 5?
Answer
The correct answer is C: 6. Number of positive integer solutions of x + y + z = n is C(n-1, 2). For n = 5: C(4, 2) = 6.
- A.3
- B.5
- C.6✓ Correct
- D.9
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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