Question 20
MediumOriginal questionTwo fair dice are thrown. : the sum is 9. : at least one die shows a 5.
What is ?
Show the answer and explanation
CorrectNot quiteAnswer D
Correct answer: D
Explanation
Given , only its 4 outcomes remain.
Two of them, and , show a 5: .
Worth noting
is , the condition the other way round.
- Concept
- Conditional probability by counting
- Typical timeTypical
- 120 s
- Your timeYours
- —
Practise this chapter →
Ten questions from Conditional Probability & Bayes' Theorem, at your own pace.