Two fair dice are thrown. What is the probability that the sum of the numbers is 9?
Answer and explanation
Correct answer: B.
- Step 1: There are equally likely outcomes.
- Step 2: The pairs with sum 9 number 4, so .
Answer
.
Why not the others: : it uses the probability for a single value on one die. : an extra outcome is counted. : it divides by 12 instead of 36.
Practise more Counting and Probability.
Free questions with an explanation for every one, and full timed EJU Japan mock tests.
More Counting and Probability questions
- A committee of 3 people is to be chosen from 8 volunteers. How many different committees are possible?
- A committee of 4 people is to be chosen from 11 volunteers. How many different committees are possible?
- A committee of 4 people is to be chosen from 7 volunteers. How many different committees are possible?
- How many 3-digit even numbers can be made from the digits 0, 1, 2, 3, 4 if no digit is used twice?
- A committee of 3 people is to be chosen from 12 volunteers. How many different committees are possible?
- A team has 4 men and 5 women. In how many ways can a group of 2 men and 2 women be chosen?