23. Exemplar exercise problems III

1. In a school only, \(3\) out of \(5\) students can participate in a competition. What is the probability of the students who do not make it to the competition?

 

2. Ram put some buttons on the table. There were \(4\) blue, \(7\) red, \(3\) black and \(6\) white buttons in all. All of a sudden, a cat jumped on the table and knocked out one button on the floor. What is the probability that the button on the floor is blue?