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Which word best describes this formula for the sequence ana_n?\newlinean=2×1(n+3)+8a_n = 2 \times 1^{(n + 3)} + 8\newlineChoices:\newline(A) explicit\newline(B) recursive\newline

Full solution

Q. Which word best describes this formula for the sequence ana_n?\newlinean=2×1(n+3)+8a_n = 2 \times 1^{(n + 3)} + 8\newlineChoices:\newline(A) explicit\newline(B) recursive\newline
  1. Examine the Formula: Look at the formula: an=2×1(n+3)+8a_n = 2 \times 1^{(n + 3)} + 8. Does it use previous terms of the sequence to find the nnth term?
  2. Determine Recursiveness: Since the formula doesn't include terms like a(n1)a_{(n-1)} or a(n2)a_{(n-2)}, it's not recursive. It directly calculates ana_n based on the value of nn.
  3. Identify Explicit Formula: The formula is an explicit formula because it allows us to find the nnth term without knowing any other terms in the sequence.

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