The sum of probability of event A and the probability of an event (not A) is…..

A coin is tossed three times. Find the probability of the following events:

(1) A: getting at least two heads,

(2) B: getting exactly two heads,

(3) C: getting at most one head,

(4) D: getting more heads than tails.

A game of chance consists of spinning an arrow which comes to rest pointing at one of the numbers 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 (see figure 16.1) and there are equally likely outcomes. What is the probability that it will point at

(1) 7?

(2) a number greater than 9?

(3) an odd number?

(4) an even number?

(5) a number less than 5?

The probability of the certain event is …..

The probability of the impossible event is….