Search found 13 matches
Hi Mitch I think now i understand the 4!/2!2! part. 3/6. 2/5. 3/4.2/3 here order within the boys has already been accounted for . same thing with the 2 girls group. When we multiply by 4! it will duplicate groups of boys and girls which have already been considered in the 3/6. 2/5. 3/4.2/3 part. e.g...
- by info2
Fri Nov 11, 2016 11:16 am- Forum: Problem Solving
- Topic: Probability and combinations
- Replies: 13
- Views: 3885
Hi All, A certain number of Quant questions on the GMAT can be solved fairly easily by using "brute force." While the technique isn't 'elegant', it can be done rather quickly in certain situations (and would be preferable to just staring at the question and hoping that an idea comes to yo...
- by info2
Fri Nov 11, 2016 10:05 am- Forum: Problem Solving
- Topic: Probability and combinations
- Replies: 13
- Views: 3885
Q: From a group of 3 boys and 3 girls, 4 children are to be randomly selected. What is the probability that equal numbers of boys and girls will be selected? A. 1/10 B. 4/9 C. 1/2 D. 3/5 E. 2/3 P(exactly n times) = P(one way) * total possible ways. P(one way): One way to get an equal number of boys...
- by info2
Fri Nov 11, 2016 7:33 am- Forum: Problem Solving
- Topic: Probability and combinations
- Replies: 13
- Views: 3885
Hi
i solved it the following way. Is my approach correct?
2*9*4= 72
2 choices (8,9) for the first digit, 9 choices for the second and 4 choices for the last digit.
- by info2
Sun Nov 06, 2016 6:10 am- Forum: Problem Solving
- Topic: How many odd three-digit integers greater than 800 are there
- Replies: 7
- Views: 5287
Note that an 'average' roll on one die is 3.5, so the average sum on three dice is 3*3.5 = 10.5. So the question is asking for the probability that you roll an 'above average' sum (11 or greater). The probability of an 'above average' sum when you roll dice is equal to the probability of a 'below a...
- by info2
Thu Oct 06, 2016 11:19 am- Forum: Problem Solving
- Topic: probability
- Replies: 8
- Views: 5967
Because of wireless service costs plummeting in the last year, and as mobile phones are increasingly common, many people now using their mobile phones to make calls across a wide region at night and on weekends, when numerous wireless companies provide unlimited airtime for a relatively small monthl...
- by info2
Fri Jul 22, 2016 4:53 am- Forum: Sentence Correction
- Topic: On account of a law
- Replies: 13
- Views: 5201
A useful distinction: A PHYSICAL VERB refers to a specific physical movement: Mary HIT the ball. John PUSHED the button. The driver TURNED the key. An ABSTRACT VERB does NOT refer to a specific physical movement: Mary LEARNED a new song. John IMPROVED every day. The driver CONSIDERED several option...
- by info2
Thu Jul 21, 2016 7:16 am- Forum: Sentence Correction
- Topic: oil barge ran..........San Juan, Puerto Rico, leaking
- Replies: 10
- Views: 3387
Hi Ron, as I checked up in Longman Dictionary of Contemporary English 5th Edition, It do have Request sb to do sth. hmm. the longman dictionary isn't the most reliable source in the world. for instance, on that same page (if you look up "request"), it gives the following as one of its exa...
- by info2
Mon Jul 18, 2016 1:28 am- Forum: Sentence Correction
- Topic: Oil Leak
- Replies: 34
- Views: 31175
Hi Rich
Can you please explain point no 2. why a rate cannot be fast? is there a general guideline as to this type of usage? i am unable to understand it. Thanks
- by info2
Thu Jul 14, 2016 1:15 am- Forum: Sentence Correction
- Topic: GPREP SC- 35
- Replies: 2
- Views: 1309
At the time of the Mexican agrarian revolution, the most radical faction, that of Zapata and his followers, proposed a return to communal ownership of land, to what had been a pre-Columbian form of ownership respected by the Spaniards. 1. land, to what had been a pre-Columbian form of ownership res...
- by info2
Sat Jun 18, 2016 3:14 am- Forum: Sentence Correction
- Topic: Mexican agrarian revolution
- Replies: 30
- Views: 15254
Mitch, thank you. So if I understood you correctly, the -ING modifier must always (logically) relate to the subject of the main clause, even though the modifier itself modifies the whole clause? Keep it simple. When a sentence begins with a VERBing modifier + COMMA : -- The noun right after the com...
- by info2
Wed Jun 15, 2016 11:09 am- Forum: Sentence Correction
- Topic: Dangling modifier vs -ING form
- Replies: 8
- Views: 3214
[I don't get the LOGIC behind E to be OA, except GMAC says "it's the OA" (and perhaps other options have CLEAR ERRORs). To WEAKEN the CONCLUSION that ground-based telescopes will soon become obsolete for advanced astronomical research purposes , we need to find some sort of EVIDENCE indic...
- by info2
Thu Jun 09, 2016 11:28 pm- Forum: Critical Reasoning
- Topic: 2016 verbal review--images from ground-based telescopes
- Replies: 23
- Views: 11937
Hi
In the question n(n+1)(n+2) why don't we consider the overlapping probability. when both events can happen together we subtract the overlapping probability. In this question a number can both be an even number and a multiple of 8. I am a bit confused why dont we solve it that way.?
- by info2
Tue Jun 07, 2016 10:16 am- Forum: Problem Solving
- Topic: probability
- Replies: 11
- Views: 5060