probability and standard deviation

True. What may be easy for you may be difficult for me and vice versa. What I mean is, if you are fine with the P&C and Prob. here, you should "probably" be fine on Test Day.

The probability questions that we do here essentially have 3 purposes:

1. To provide difficult content, so that the questions you see on GMAT day do not come anywhere close to stressing you out;

2. To provide deep content, so that you are drilled on many concepts (often within one problem). This way, you should be familiar with 99% of potential approaches you could take on test day.

3. To have fun with brain-teasers.

I certainly had a lot of difficulty with the challenge Q problems posted by users -- both in probability/counting and other areas -- because that has always been a weak point for me (I was a math minor and I still find it tough!). But the GMAT tests concepts much more so than depth, meaning:

(a) in a probability question on the real GMAT, you can usually do the math without formulas. However, the formulas are a nice double-check, particularly if you get such a question early on.

(b) practice makes close-to-perfect.

Hi JP..Thanks for sharing that bit of info.

I've covered the basic math concepts now and I want to move onto Perm. & Comb. and probability questions, where would be a good place to start off here? I've seen the questions in the Math forum, they seem kinda advanced for me