1. ## Simple probability question

Hi There's a 15% chance to get a blue.

I've got 3 chances to hit blues. What's the chance I hit exactly 2/3 blues?

2. ## Re: Simple probability question

Originally Posted by VII
Hi There's a 15% chance to get a blue.
I've got 3 chances to hit blues. What's the chance I hit exactly 2/3 blues?

As written, it is too vague to answer.

3. ## Re: Simple probability question

There's some sweets in a bag. There's a 15% chance to get a blue sweet.
I will take a sweet out, and put it back in.
If take a sweet out and put it back 3 times, what's the chance 2/3 of those sweets will be blue?

4. ## Re: Simple probability question

Originally Posted by VII
There's some sweets in a bag. There's a 15% chance to get a blue sweet. I will take a sweet out, and put it back in.
If take a sweet out and put it back 3 times, what's the chance 2/3 of those sweets will be blue?
Simple binomial probability: $\binom{3}{2}(.15)^2(.85).$

5. ## Re: Simple probability question

I don't understand that >.>
What's the % chance of getting 2/3 blues?

6. ## Re: Simple probability question

Originally Posted by VII
I don't understand that >.>
What's the % chance of getting 2/3 blues?
If you do not understand how to evaluate a binomial coefficient, $\binom{N}{k}$ then you have no business trying this problem.