|
|||||||
![]() |
|
|
LinkBack (24) | Thread Tools | Search this Thread | Display Modes |
|
|
#13 (permalink) |
|
Eager!
![]() Join Date: Apr 2005
Location: Malvka,Atlanta
Posts: 31
![]() |
Re: A complete guide to Permutation, Combination and Probability. All you need for GMAT
Hi,
Thanks for your answers , I'm solving the exercise and comparing my answers with yours.How did you do No.4-can u show me? your answer is D isn't it? I don't know why B is marked already. A bag of 10 marbles contains 3 red marbles and 7 blue marbles. If two marbles are selected at random, what is the probability that at least one marble is blue? A. 21/50 B. 3/13 C. 47/50 D. 14/15 E. 1/5 Thanks! |
|
|
|
|
#14 (permalink) |
|
Within my grasp!
![]() ![]() Join Date: Dec 2004
Location: Chicago
Posts: 421
![]() |
Re: A complete guide to Permutation, Combination and Probability. All you need for GMAT
probability that they're both red = (3/10) x (2/9) = 1/15
Probability that at least one is blue = 1 - probability that they're both red = 1 - 1/15 = 14/15 So the answer is D |
|
|
|
|
#16 (permalink) |
|
Eager!
![]() Join Date: Apr 2005
Location: Malvka,Atlanta
Posts: 31
![]() |
Re: A complete guide to Permutation, Combination and Probability. All you need for GMAT
My answer for the 9th problem is D not E.How did u arrive at 1/32?
Problem given below: If four fair coins are tossed, what is the probability of all four coming up heads? A. 1/4 B. 1/6 C. 1/8 D. 1/16 E. 1/32 |
|
|
|
|
#18 (permalink) |
|
Within my grasp!
![]() ![]() Join Date: Dec 2004
Location: Chicago
Posts: 421
![]() |
Re: A complete guide to Permutation, Combination and Probability. All you need for GM
I also put D (not E) for that question. You were probably looking at the two E's that I put for the two questions before that. So I got 1/16 too
![]() |
|
|
|
|
#20 (permalink) |
|
Eager!
![]() Join Date: Mar 2005
Location: California
Posts: 31
![]() |
Re: A complete guide to Permutation, Combination and Probability. All you need for GMAT
Do we have the OAs ?
My answers: B,C ,A,C, D,B,B,E,E,D,B,D,E,D,B,E,A,D,D,D Twinsplitter: My answers were the same as yours except for the 6th question from the end. A fair, six-sided die is rolled. What is the probability of obtaining a 3 or an odd number? My answer to this was 1/6 + 1/2 = 2/3 and option (D). Is this right ?Last edited by prometheus : 04-24-2005 at 12:33 AM. Reason: Add details |
|
|
![]() |
| Thread Tools | Search this Thread |
| Display Modes | |
|
|
Contact TestMagic TestMagic Forums Archive
Link to TestMagic
TestMagic Locations
Legal
Privacy
Partner Sites:
GMAT Sentence Correction
SAT 2400
Content Relevant URLs by vBSEO 3.0.0
Copyright © 1998-2008 TestMagic
Ad Management by RedTyger