# Thread: A (simple) question on probability that has become confusing

1. ## A (simple) question on probability that has become confusing

Hi all. This question is in a chapter that involves permutations and combinations and I'm a little thrown by it. I can't work out the answer to c)

i have the following for:
a) 0.50
b) 0.25
c)????

I think c) is just 0.25 as well...but have a feeling I'm wrong...or could have a/b. wrong as well! please help! there are no answers in the back of the book.

many thanks!

2. ## Re: A (simple) question on probability that has become confusing

Originally Posted by flashylightsmeow
Hi all. This question is in a chapter that involves permutations and combinations and I'm a little thrown by it. I can't work out the answer to c)
i have the following for:
a) 0.50
b) 0.25
c)????
I think c) is just 0.25 as well...but have a feeling I'm wrong...or could have a/b. wrong as well! please help! there are no answers in the back of the book.

Is it true that $\displaystyle B\subset A~?$

yes

4. ## Re: A (simple) question on probability that has become confusing

so...does that mean the answer is 0.25?

5. ## Re: A (simple) question on probability that has become confusing

Originally Posted by flashylightsmeow
so...does that mean the answer is 0.25?

Well $\displaystyle A\cap B=B$. So yes.
However, I do find the wording of the question some what odd.

6. ## Re: A (simple) question on probability that has become confusing

Agh I know, It's from Paul Newbold and William Carlson's Statistics for Business and Economics...load of absolute cr*p! riddles with mistakes. Thank you very much Plato! No doubt there will be more posts like this in the future!