Question

3. Find the common ratio in the following sequence20, 10,5, 2.5, ...2.-101/22.5

Answer 1

$\begin{gathered} 20,10,5,2.5,\ldots, \\ A\text{ possible sequence will be:} \\ a_n=5\times2^{3-n} \end{gathered}$

Where 2, is the common ratio