Question

A spinner contains the numbers 1 through 50. What is the probability that the spinner will land on a number that is not a multiple of 9?

Answer 1

$\begin{gathered} Multiple\text{ of 9}\Rightarrow9,18,27,36,45(\text{ 5 number)} \\ Probability\text{ of getting these numbers}\Rightarrow\frac{5}{50}=0.1 \\ So, \\ \text{Probability of getting a number that not belon to multiple of 9,} \\ \Rightarrow1-.1=0.9 \end{gathered}$