Aprender
Una secuencia en la que cada término difiere del anterior en una cantidad constante (diferencia común).
An arithmetic sequence (also called arithmetic progression) is a sequence of numbers where the difference between consecutive terms is constant. This constant is called the 'common difference'. Arithmetic sequences are among the most fundamental patterns in mathematics and appear frequently in real-world situations like counting, scheduling, and linear growth.
aₙ = a₁ + (n-1)d, where d is the common difference
- 2, 5, 8, 11, 14... (common difference = +3)
- 20, 17, 14, 11, 8... (common difference = -3)
- 1, 1, 1, 1, 1... (common difference = 0)
Cómo reconocerlo
- Calculate the difference between consecutive terms
- If all differences are the same, it's arithmetic
- The pattern is 'add (or subtract) the same number each time'
Errores comunes
- Confusing with geometric sequences (multiply vs add)
- Miscounting when the common difference is negative
- Forgetting that constant sequences (d=0) are also arithmetic
Resolución paso a paso
Encuentra el siguiente término: 2, 5, 8, 11, ?
- Calcula las diferencias: 5-2=3, 8-5=3, 11-8=3
- Todas las diferencias son iguales: diferencia común = 3
- Es aritmética. Suma 3 al último término
- El siguiente término es 14
Respuesta: 14