4. Find the probability

A bag contains 4 red balls, 6 blue balls and 7 green balls. A ball is chosen at random from the bag without looking into the bag. Find the probability that:

 

(i) the chosen ball is red.

 

(ii) the chosen ball is green.

 

(iii) the chosen ball is not blue.

 

Answer:

 

(i) The probability of choosing a red ball is .

 

(ii) The probability of choosing a green ball is .

 

(iii) The probability of choosing a non-blue ball is .