I hear more and more about Probability Questions on the GMAT and that some have gotten up to 3 or 4 Questions.
The real Question here is : Just what kind of Probability Questions are being asked ?
Do you have to know
- Hypergeometric Probability Distribution
- The Binomial Probability Distribution
or just Combinations and basic Probability (AND / OR types) ?
On GMAT I've encountered the only probability question like:
You have a box containing 10 balls 4 of which are black. If you pick up 2 of them what is probability that both are black?