A complete guide to Permutation, Combination and Probability. All you need for GMAT

[coyote]

Why only GMAT, these links are indeed useful for the GRE test takers (includes me) as well.
Thanks for the same!

[mrj]

Let the 3 Asians b considered as one person/seat
Similarly let 2 Europeans b considered as one person/seat
So now we have 3 people (1 Asian,1 European and 1 American) to arrange on 3 seats.
=3!=6
But the 3 Asians and 2 Europeans can sit in 3! and 2! different ways

So for each 3! arrangements,there r 6 possiblities for Asains and 2 possiblities for Europeans.

i.e. 3!* 3!* 2!=6*6*2=72

Let me know the correct answer...

Hey,
Came across this question: Possible ways to arrange 3 asians, 2 europeans and an american if the asians and eurpoeans want to sit together.

The explaination above seems good, except that one thing confused me a bit: since you consider asiand and europeans as a single entity should you not consider them swapping seats between them. so I seem to think that the answer should be 72 * 2 = 144. Am I missing something here?

Thanks! (pls be gentle, first posting on the forum

[jackgreat]

Thanks...a great resource for one of the most advanced topics in GMAT Math.

Here is a link to a site with more info on P&C. Nice one as well.

Permutations and combinations - Topics in precalculus

[khuram]

i think its better to concentrate material what we have.. beacuse more contents make confused .. to me atleast..

[wasleys]

sorry guys, I am writing just because I need to post some stuff before starting to do download docs...bye-bye

Moderators take action against people inflating their post count in this way.

[kpaul212]

This clears up so many of my questions about probability on the GMAT. Thanks!

[thehall]

Thanks for these great resources.

My answers to that document are as follows, anybody else who did them let me know what you got:
B
C
A
C
D (the way I did this took kind of long, if somebody else could let me know how they did it I'd appreciate it)
B
B
E
E
D
B
D
E
E
B
E
A
D
D

Are we all comfortable using these answers? If not, which ones have we decided to change?
1 b

2C3A4C5d6B7B8E9E10D11B12D13E14E15B16E17A18D
19
d

[miaw99]

Yep, i guess this forum is really nice.
In my country, there is only a few forum that discuss mathematics.

[rajibgmatNJ]

Reflections Vol20, No3, Aug 95

[vijay vishnu]

the post was years back but the material is very useful ..thanks!!