samantha753 samantha753
  • 07-02-2018
  • Mathematics
contestada

A recursive rule for a geometric sequence is a1=3;an=12an−1 . What is the explicit rule for this sequence?

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sqdancefan
sqdancefan sqdancefan
  • 08-02-2018
From the recursive rule, you can tell the initial value is 3 and the common ratio is 12. The explicit rule is always
.. (n-th term) = (initial value)*(common ratio)^(n -1)

Subsituting the values you know, you have
.. an = 3*12^(n-1)
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