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iluminado
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toujours28
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here is the link to bb's review. top-gmat-prep-books-guides-reviews-comments-77703.html

Remember if your already performing well this may not provide an impovement worth $79. Don't look to it as a source of extra questions. It's pretty much just a study guide.
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congrats 4 ur score
what score u get the first time
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which topics were tested more often
probability,time work ,mixtures
were they representative of OG
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testtaker
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which topics were tested more often
probability,time work ,mixtures
were they representative of OG
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testtaker
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which topics were tested more often
probability,time work ,mixtures
were they representative of OG
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rich28
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Great job I got the same combo/ratio type of problem 2 weeks ago. I freaked and tried to do the long math when in fact I believe it is easy. would this be correct? Find the ratio of 6C4 to 6C3.=(6!/4! * 2!)(3!*3!/6!)
Cancel the sixes and you end up with 3/4?
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yep rich thats exactly how you do it. that is how I attacked it on the actual test but I think I made a math error and still got it wrong.
a faster way to do combinations is like this
6C4 = (6*5*4*3)/(4*3*2*1) or
6C3 = (6*5*4)/(3*2*1)

see what I mean?

Also xCr = xCx-r
SO 12C8=12C4

test taker:

I got 1 or 2 problems involving work and rates but they were very simplistic, nothing as hard as kaplan. I probably didn't see them because I was making stupid mistakes like the one in the above problem.

I'm really good at mixture problems and didn't see a one. I was really dissapointed about that.

My best advice is get really good at doing tough problems quickly using kaplan. then once time isn't a factor anymore go back to the moderate and make sure your not falling asleep at the wheal on those. On the actual test check all your work. With a couple of mistakes on moderates you might not even be given the tough problems you practice so long to understand. I think that is what may have happened to me.

P.S. I got a 610 first time around. details in the link of my topic message
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That's a great improvement. Sounds like we got the same test. I also had 2 or 3 work problems,no mixtures and the same combo problem. I agree with you on the Kaplan books, I have the normal one and after the test I bought the 800 book. I feel a lot more comfortable now doing tough quant.

Thanks for the advice and good luck on the applications.


Rich
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numlock31
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Was the combination problem a word problem that said something like "there are 6 women and 4 men etc" or was it just a pure math problem like find the ratio of C(6,4) to C(6,3)?

In other words, what was the hardest part of the poblem. The actual math or figuring out which equations to set up.

Also were any combination/permuation problems are hard as this one:

There are 10 professor and 7 graduate students in group. How many way can you make a group of 3 if at least one professor must be in the group?

The answer is the sum of all of the followng which should be 560.

ppp = (10*9*8)/3!

ppg = (10*9*7)/2!

pgg = (10*7*6)/2!
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rich28
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It was a word problem. I think the whole key with the Gmat quant is you have to figure out how to solve the problem by using the easiest method or trick. When I took the test I jumped right in and started to caluculate the answers. If I took ten seconds and put it in a ratio I would have seen I could have cancelled. Instead I worried about dividing a big combination number by another. I saw nothing as hard as your problem. I think the problems on this forum for prob. and combo's are a lot harder than the test. But keep in mind, I only got a 41 on quant, not a 49 or 50 that others get.

Rich
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