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Use geometric sequence formulas

{c(1)=56c(n)=c(n1)12\begin{cases}c(1)=56\\\\ c(n)=c(n-1)\cdot \dfrac{1}{2} \end{cases}
What is the 4th4^{\text{th}} term in the sequence?
  • Your answer should be
  • an integer, like 66
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
  • an exact decimal, like 0.750.75
  • a multiple of pi, like 12 pi12\ \text{pi} or 2/3 pi2/3\ \text{pi}