Bunuel
Statement (1): The 5 players scored a total of 20 goals. If each player scored at least 1 goal, we can distribute the goals as follows:
- Worst-case scenario (for our question): We want to distribute the goals as evenly as possible to minimize the chance of someone scoring 5 or more.
- Example: 4, 4, 4, 4, 4. This totals 20 goals, and no one scored 5 or more.
- However, consider 1, 2, 3, 6, 8. This also totals 20 goals, and two players scored more than 5.
Since we can find distributions where no one scored 5+ goals and other distributions where someone did, statement (1) is insufficient.
Statement (2) says that no two of the 5 players scored the same number of goals. Since each player scored
at least one goal, the
minimum number of goals scored by the five players would be 1, 2, 3, 4, and 5. This totals 1 + 2 + 3 + 4 + 5 = 15 goals.
The key is that to have five
different positive integer scores, one of those scores
must be at least 5. There's no way to have five different positive integers where the largest is less than 5 (e.g., you can have 1, 2, 3, 4, but you can't have five distinct positive integers all less than 5).
Therefore, statement (2) alone is sufficient to conclude that at least one player scored at least 5 goals.