If in a chess tournament each contestant plays once against each of the other and in all 45 games are played, then the number of participants is
- A. $9$
- B. $10$
- C. $15$
- D. None of these
✅ Correct Answer: $10$
Explanation
If there are $n$ participants, number of games $= \frac{n(n - 1)}{2} = 45$. Solving gives $n = 10$.
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