Question 14
Back to Exercise
How many solutions in non-negative integers does x + y + z = 10 have?
- A 36
- B 55
- C 66 Correct
- D 120
Correct Answer: Option C
Stars and bars: (10 + 2)C2 = 12C2 = 66
Trap: 36 = 9C2 requires each to be at least 1.
Answer: 66
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