Question

An urn contains 10 red balls, 20 yellow balls, and 40 orange balls. If you reach into the urn and select a single ball at random, what is the probability of selecting a red ball? State your answer as a fraction.

Answer 1

From the problem, there are 10 red balls, 20 yellow balls and 40 orange balls.

The probability of selecting a red ball is the number of red balls divided by the total number of balls :

`\begin{gathered} p=(10)/(10+20+40)=(10)/(70) \\ p=(1)/(7) \end{gathered}`

The answer is 1/7