Use geometric sequence formulas

Given the formula of a geometric sequence, either in explicit form or in recursive form, find a specific term in the sequence.
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Problem

b, left parenthesis, n, right parenthesis, equals, minus, 1, left parenthesis, 2, right parenthesis, start superscript, n, minus, 1, end superscript
What is the 5, start superscript, t, h, end superscript term in the sequence?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3, slash, 5
  • a simplified improper fraction, like 7, slash, 4
  • a mixed number, like 1, space, 3, slash, 4
  • an exact decimal, like 0, point, 75
  • a multiple of pi, like 12, space, p, i or 2, slash, 3, space, p, i