luckyocean

Thanks! this was very helpful :)

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Anyone, I'm not familiar with the phrase xCy. Does xCy = x!/(x-y)!y! ?? linlin, I don't think it matters whether they are distinct, they could all be completely different. It's just that it doesn't matter what order they are drawn in.

Oops, sorry!!! NEVER MIND! The answer was NOT listed as 288 *blush*, it IS 210 which DOES work with 10!/(10-4)!4! I misread the answer sheet, 288 is the answer to the previous question! sorry!!!

THE BREAK: I've heard you get the analytical section first, and then a 10 minute break. - Are you required to leave your chair during this 10 minute break? - Do the testing staff have to restart the test for you after your break? THE EXPERIMENTAL SECTION: - Is there still a 4th, unlabelled experimental section (e.g., Analytical Writing, Break, Verbal, Quant, Quant), before you see your scores? - Did you encounter any of the "new" types of questions (e.g. fill-in-the-blank math response) and if so, do you know if it was part of your score? Thanks in advance!

Hi e.cartman, that makes sense, but just wondering, why not 52C4 for the second question?

Thanks, although I didn't fully understand that explanation, could it be phrased another way?? I already used permutation, n!/(n-r)!r! for no order importance, not combination, n!/(n-r)! for order importance, but never heard of n!/r!, what's that called? Here is the ETS math review. http://www.ets.org/Media/Tests/GRE/pdf/GREmathPractice.pdf

Data analysis exercise #9 From a box of 10 light bulbs, 4 are to be removed. How many different sets of 4 bulbs could be removed? Answer: 10!/4! = 288 --- WHY 10!/4!? I can't understand why it is not permutation, n!/(n-r)!r! 10!/(10-4!)4! Because this question sounds the same: You are going to draw 4 cards from a standard deck of 52 cards. How many different 4 card hands are possible? And in this case you use: n!/(n-r)!r! = 52!(52-4)!4! What's the difference between these 2 questions? When to use which??

Anyone know or care to guess, do you need to know any of the following formulae for GRE Math? 1 (a+b)sq = asq+2ab+bsq 2 (a-b)sq = asq-2ab+bsq 3 (a+b)(a-b)= asq - bsq 4 (a+b)cubed = acubed + 3asqb + 3 absq + bcubed 5 (a-b)cubed = acubed - 3asqb + absq - bcubed 6 acubed + bcubed = (a+b)(asq + ab + bsq) 7 quadratic formula