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A total of 11 teams participated in a hockey tournament in which every team played exactly one match with every other team. In any match, a team gets four points for a win, three points for a draw and two points for a loss. The total score of no two teams was the same at the end of the tournament. If the number of points of the team with the highest total score is 35, then which of the following could be the number of points of the team with the least total score?

Question

A total of 11 teams participated in a hockey tournament in which every team played exactly one match with every other team. In any match, a team gets four points for a win, three points for a draw and two points for a loss. The total score of no two teams was the same at the end of the tournament. If the number of points of the team with the highest total score is 35, then which of the following could be the number of points of the team with the least total score?

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Solution

Para resolver este problema, sigamos los siguientes pasos:

  1. Calcular el número total de partidos jugados: En un torneo donde cada equipo juega contra todos los demás equipos una vez, el número total de partidos se puede calcular usando la fórmula de combinaciones: (112)=11×102=55 \binom{11}{2} = \frac{11 \times 10}{2} = 55 Así que se jugaron 55 partidos en total.

  2. Determinar la distribución de puntos: Cada partido tiene tres posibles resultados: victoria, empate o derrota. Los puntos se distribuyen de la siguiente manera:

    • Victoria: 4 puntos para el ganador, 2 puntos para el perdedor.
    • Empate: 3 puntos para cada equipo.
  3. Calcular el total de puntos distribuidos: En cada partido, se distribuyen un total de 6 puntos (4+2 en caso de victoria/derrota o 3+3 en caso de empate). Por lo tanto, el total de puntos distribuidos en el torneo es: 55×6=330 55 \times 6 = 330

  4. Distribución de puntos única: Se nos dice que el total de puntos de ningún equipo es igual al de otro equipo. Esto significa que los puntos deben ser números enteros consecutivos.

  5. Determinar los puntos del equipo con la menor puntuación: Sabemos que el equipo con la puntuación más alta tiene 35 puntos. Si los puntos son consecutivos y hay 11 equipos, los puntos deben ser: x,x+1,x+2,,x+10 x, x+1, x+2, \ldots, x+10 Donde x+10=35x+10 = 35. Resolviendo para xx: x=3510=25 x = 35 - 10 = 25

  6. Verificar la suma total de puntos: La suma de los puntos de todos los equipos debe ser igual a 330. La suma de una serie de números consecutivos se puede calcular usando la fórmula de la suma de una progresión aritmética: Suma=n2×(primer teˊrmino+uˊltimo teˊrmino) \text{Suma} = \frac{n}{2} \times (\text{primer término} + \text{último término}) Donde nn es el número de términos. En este caso: Suma=112×(25+35)=112×60=11×30=330 \text{Suma} = \frac{11}{2} \times (25 + 35) = \frac{11}{2} \times 60 = 11 \times 30 = 330 La suma es correcta.

Por lo tanto, el número de puntos del equipo con la menor puntuación es 2525.

This problem has been solved

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