- #1
kent davidge
- 933
- 56
Homework Statement
Bob had a box containing 9 green balls and 1 white ball. A Bob's friend removed one ball from the box without telling Bob what was its color. Now what's the probability for Bob picking up one green ball from the box?
Homework Equations
[/B]
Not aware of "formulas", I just use those I think are useful for the problem in question.
The Attempt at a Solution
If Bob's friend removed the white ball, then the chance for Bob picking up a green ball is 9/9 = 100%.
If Bob's friend removed a green ball, then there's 8/9 chance.
But I would like to get one total probability, not two conditions like these.