Question

Tom rolls 2 fair dice and adds the results from each.
Work out the probability of getting a total that is a factor of 21.

Answer 1

Answer:

number of possible outcomes of rolling 2 fair dice=36

Factors of 21=3,7

Possible outcomes of getting a total that is a factor of 21 is

1-2 ,

1-6,

2-1,

2-5,

3-4,

4-3,

5-2,

6-1

Number of possible outcomes of getting a total that is a factor of 21=8

probability of getting a total that is a factor of 21=8/36=2/9