Find the formula for $U_n$ in the sequence $\\frac{1}{2}, 2, 8, 32, 128, \\dots$.
University of Ilorin MTH101 ester past question
- $U_n = \\frac{1}{2} \\cdot 4^{n-1}$
- $U_n = \\frac{1}{2} \\cdot 2^{n-1}$
- $U_n = \\frac{1}{2} \\cdot 8^{n-1}$
- $U_n = \\frac{1}{2} \\cdot 16^{n-1}$
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