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.

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Answer 1

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

Answer 2

Step-by-step explanation:

No of possible outcome = 36

Factors of 21 = 3, 7

1 and 2

1 and 6

2 and 1

2 and 5

3 and 4

4 and 3

5 and 2

6 and 1

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

Probability = 2/ 9

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