A coin is tossed four times, with the help of a tree diagram, list all possible combined outcome and answer the following questions below:

a. How many of these have tail showing?

b. How many of these have two tails showing?

c. How many of these have at most three heads showing?

Solution:

(a)

15 of these have tail showing

(b)

6 of these of these have two tails showing

(c)

15 of these have at most three heads showing