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What is the explicit formula for this sequence?2, 6, 18, 54, 162, …A.an = 3(2)(n – 1)B.an = 2(3)nC.an = 2 + 3(n – 1)D.an = 2(3)(n – 1)

Question

What is the explicit formula for this sequence?2, 6, 18, 54, 162, …A.an = 3(2)(n – 1)B.an = 2(3)nC.an = 2 + 3(n – 1)D.an = 2(3)(n – 1)

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Solution

Para encontrar la fórmula explícita de la secuencia dada, sigamos estos pasos:

  1. Observemos los términos de la secuencia: 2, 6, 18, 54, 162, ...

  2. Identifiquemos el patrón de la secuencia. Cada término parece ser el resultado de multiplicar el término anterior por 3.

    • 6 = 2 * 3
    • 18 = 6 * 3
    • 54 = 18 * 3
    • 162 = 54 * 3
  3. Esto sugiere que la secuencia es una progresión geométrica donde cada término se obtiene multiplicando el término anterior por 3.

  4. La fórmula general para una progresión geométrica es: an=a1r(n1) a_n = a_1 \cdot r^{(n-1)} donde a1 a_1 es el primer término y r r es la razón común.

  5. En este caso, el primer término a1 a_1 es 2 y la razón común r r es 3.

  6. Sustituyendo estos valores en la fórmula general, obtenemos: an=23(n1) a_n = 2 \cdot 3^{(n-1)}

Por lo tanto, la fórmula explícita para la secuencia es: an=23(n1) a_n = 2 \cdot 3^{(n-1)}

La opción correcta es: D. an=23(n1) a_n = 2 \cdot 3^{(n-1)}

This problem has been solved

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