1. ## Conditional Probability?

What is the probability on a single roll of a pair of dice, that the sum is 6, given that at least one die came up 1?

I'm thinking that there are 11 ways to roll the pair with a 1 on at least one die.
Of those 11 ways 2 sum to 6 (1&5, 5&1), so my answer is 2/11

Is this correct?

2. ## Re: Conditional Probability?

Yes, that is correct.

3. ## The Following User Says Thank You to staassis For This Useful Post:

mathprof (04-12-2014)

4. ## Re: Conditional Probability?

Thank you. I was confused because it was a multiple choice question with these answers:
A) 1/30 B) 1/5 C) 1/36 D) 1/6 E) 1/12

5. ## Re: Conditional Probability?

I see... There must be a typo either in the problem formulation or the list of potential answers.

6. ## Re: Conditional Probability?

how can I get some help with problems?

7. ## Re: Conditional Probability?

Originally Posted by brownsugar
how can I get some help with problems?
You would need to start with a fresh thread by demostrating that you have worked on a solution yourself. It would best if you could share the parts of your solution that you feel confident about. After that people would start giving you hints, hopefully.

 Tweet