7. Two mark example problem I

A bag contains $5$ blue balls and $4$ green balls. A ball is drawn at random from the bag. Find the probability that the ball drawn is (i) blue (ii) not blue.

 

Answer:

 

The probability that the ball drawn is blue $=$ $\frac{i}{i}$

 

The probability that the ball drawn is not blue $=$ $\frac{i}{i}$