Search found 84 matches
- by brijesh
Fri Sep 17, 2010 10:56 am- Forum: Problem Solving
- Topic: probability
- Replies: 3
- Views: 1109
Say Group A (3M, 1W) and group B (2W, 1M) Total no of Ways for selecting 2 canoe riders from group A and 2 from group B= 4C2 * 4C2 = 36 No of ways of selecting canoe riders following the condition: Two canoe riders must be selected from each of two groups of campers and in that exactly 2 men and 2 w...
- by brijesh
Fri Sep 17, 2010 10:40 am- Forum: Problem Solving
- Topic: Two canoe riders
- Replies: 9
- Views: 2047
Q: A boat covers 48 km upstream and 72 km downstream in 12 hours , while it covers 72 km upstream and 48 km downstream in 13 hours. The speed of the stream is : First eq. 48/(x-y) + 72/(x+y) = 12 Sec eq. 72/(x-y) + 48/(x+y) = 13 1/(x+y)[72*72- 48*48]= 12*72- 13*48 x+y = [72*72- 48*48]/ [12*72- 13*4...
- by brijesh
Thu Sep 16, 2010 11:06 am- Forum: Problem Solving
- Topic: Elementary Boat problem
- Replies: 2
- Views: 1268
@brijesh, I think i have understood the concept. But if you elaborate few steps? or atleast few point, it would be appreciated. Have you solved it like since the 2 events are independent, then P(AB) = P(A) * P(B). Here, one student is sellected (that may be <25 year old male or female) probabality=...
- by brijesh
Thu Sep 16, 2010 5:14 am- Forum: Problem Solving
- Topic: Probability_Selection Problem
- Replies: 6
- Views: 3295
sanju09 wrote:In the x y-coordinate plane, the points (a, b) and (a + k, b – 3) are on the line defined by y = 2 x – 5. What is the value of k?
(A) -5/2
(B) -5/3
(C) -3/2
(D) -2/3
(E) -2/5
C- -3/2
- by brijesh
Thu Sep 16, 2010 2:12 am- Forum: Problem Solving
- Topic: In the x y-coordinate plane
- Replies: 7
- Views: 5356
Hi, Can anyone help me to solve this circumference problem?? I am having a silly doubt here.. I have attached the diagram in the word attachment. please go through it and help me. I had gone for calculating the circumference of the sector which comes out to be (PIE * r)/2, which is 1100/7 = 157. No...
- by brijesh
Wed Sep 15, 2010 8:28 pm- Forum: Problem Solving
- Topic: Quadrant Problem_help needed
- Replies: 3
- Views: 1085
In the graduating class of a certain college, 48% of the students are male and 52% are female. In this class 40% of the male and 20% of the female students are 25years old or older. If one student in the graduating class is randomly selected, approximately what is the probability that he or she will...
- by brijesh
Wed Sep 15, 2010 8:22 pm- Forum: Problem Solving
- Topic: Probability_Selection Problem
- Replies: 6
- Views: 3295
A coin is tossed 12 times in succession . If the first 11 produce all tails . What is the probability that the 12th one will also be a tail. Each of the 12 tuple outcome is equally likely to occur..??[/quote] lets add a few more Qs here: A coin is tossed 12 times in succession . What is the probabil...
- by brijesh
Wed Sep 15, 2010 8:12 pm- Forum: Problem Solving
- Topic: probability
- Replies: 3
- Views: 1220
Hi, Can anyone please help me with this problem?? If each term in the sum a1 + a2 + ......+ an is either 7 or 77 and the sum equals 350, which of the following could be equal to n?? 1) 38 2) 39 3) 40 4) 41 5) 42 (1+11+1........)=50 lets one set of 11 and 1 = 12 remain= 38 (consider 38 1s) so the to...
- by brijesh
Tue Sep 14, 2010 11:07 am- Forum: Problem Solving
- Topic: Series Summation Problem
- Replies: 3
- Views: 1031
Instructions for Question numbers 1 to 5 : In a Nut - Bolt factory 180 workers are working 6 hours a day . Out of 180 workers there are some men, some women and rest are boys . All the workers can produce either nut or bolt or both of them . A man can produce 60 nuts and 80 bolts in each hour and a...
- by brijesh
Tue Sep 14, 2010 10:13 am- Forum: Problem Solving
- Topic: Nut-Bolt Series
- Replies: 5
- Views: 5370
The question says "he turns over 4 cards" - which means picking 4 cards out of 12. Why would it be a permutation rather than just combination. Quite don't agree. Please explain. Hi! Jim is right here, the cards (6 each) are from different suit- u can consider the other features, say color...
- by brijesh
Mon Sep 13, 2010 8:34 am- Forum: Problem Solving
- Topic: Tough probability question
- Replies: 4
- Views: 1267
When positive integer n is divided by 5, the remainder is 1. When n is divided by 7, the remainder is 3. What is the smallest positive integer k such that k+n is a multiple of 35? a) 3 b) 4 c) 12 d) 32 e) 35[/quote] I tried as follows: K+n may be one of the 35, 70, 105, 140....etc last digit of n ma...
- by brijesh
Mon Sep 06, 2010 2:52 am- Forum: Problem Solving
- Topic: OG Quant PS Question Answer Explanation
- Replies: 3
- Views: 1125
I think u need to mention for how many seconds the words remain lighted... suppose the first word remain lighted for A s Second word emain lighted for B s and the third word remain lighted for C s the ans : LCM (A+2, B+2, C+2): i.e. the time when the entire display will again turn on simultaneously?
- by brijesh
Wed Sep 01, 2010 8:25 pm- Forum: Problem Solving
- Topic: Too tough for Gmat.
- Replies: 5
- Views: 1558
A speaks truth in 60% of the cases while B speaks truth in 70% of the cases. When they lie they say the same lie. In what percent cases are they likely to contradict each other? A) 30% B) 40% C)46% D) 54% E) 80% ANs: OA is C Hi fieinds! what may be the answer when the Q is as follows: A speaks trut...
- by brijesh
Wed Sep 01, 2010 8:03 pm- Forum: Problem Solving
- Topic: probability
- Replies: 3
- Views: 10224
Thank you for the reply, but while reading the Q statement I could not understand about which angle it is talking about. In Q`s statement : An angle is 4 times its supplement ( i.e. that angle is 30x 4= 120) Find the new angle formed....this sentence seems vague. It is not distinctly telling about t...
- by brijesh
Mon Aug 30, 2010 10:37 am- Forum: Problem Solving
- Topic: 4 times it’s supplement
- Replies: 5
- Views: 2771