Search found 84 matches
(1/2)^x>(1/1000)
2^x>1000
2,4,8,16,32,64,128,256,512,1024
x=10
I don't know if there are any other ways to solve it, but this is the formula way.
Please correct me if I made a mistake.
- by EricLien9122
Tue Nov 18, 2008 9:20 am- Forum: Problem Solving
- Topic: Probability
- Replies: 6
- Views: 1378
It's hard to predict the out come of divisibility, because the outcome can be a fraction regardless the even or odd rules. Q: set x has n number of int. is mean even? Statement 1: n is even mean can be fraction, odd or even insufficient Statement 2: all int. in x are even mean can be fraction or eve...
- by EricLien9122
Tue Nov 18, 2008 7:14 am- Forum: Data Sufficiency
- Topic: Mean Even
- Replies: 9
- Views: 2209
- by EricLien9122
Tue Nov 18, 2008 6:51 am- Forum: Data Sufficiency
- Topic: number prop / vic from gmat2 - corrected!
- Replies: 6
- Views: 1608
2. Rain,Rain,Rain, N.Rain,N.Rain
probability of exactly 3 days of rain= (# of ways with 3 days of rain)/(total number of possibility of a raining day in 5 days)
(5!)/(2!3!)/(5!)=1/(2*2*3)=1/12
I think this is the right answer, please correct me if i made a mistake.
- by EricLien9122
Mon Nov 17, 2008 9:12 pm- Forum: Problem Solving
- Topic: simple but tricky
- Replies: 10
- Views: 6154
Q: P(w)+P(E)=?
1. P(w)*P(E)=0
Insufficient, b/c we can't manipulate the equation into P(W)+P(E)
2. P(W)-P(E)=0.2
Insufficient, b/c we can't manipulate the question in to P(W)+P(E)
1+2:
Still insufficient, b/c we can't manipulate the equation into P(E)+P(E).
- by EricLien9122
Sun Nov 16, 2008 1:06 pm- Forum: Data Sufficiency
- Topic: gmat prep ds
- Replies: 7
- Views: 2054
In must be true questions, try to disprove the answer choice. A. x>2, if x=-1, then x is not greater than 2. B. x>-7, smallest x=-1.999 or largest x=6.9999, which both are greater than -7. C. x<2, if x=6, then x is not less than 2. D.-7<x<2, if x=5, then x is not in that range. I hope this help, ple...
- by EricLien9122
Sun Nov 16, 2008 12:38 am- Forum: Problem Solving
- Topic: PS (Must be True) Explanation
- Replies: 3
- Views: 1395
I think the big problem with this sentence is "they" refers to lawyers while should refers to judge. we can rule out A and C. D: "them refers to lawyers while should refer to patent holder. B: act (purual) should be acts (singular). as for E, I don't see a subjunctive mood. It's only ...
- by EricLien9122
Sun Nov 16, 2008 12:26 am- Forum: Sentence Correction
- Topic: Manhattan CAT Q...problem with subjunctive mood
- Replies: 9
- Views: 2699
just curious, what's the source of this question? I always thought the actual GMAT would have easier number for weighted average calculation.
- by EricLien9122
Sat Nov 15, 2008 11:32 pm- Forum: Problem Solving
- Topic: Question 33 - Help please :)
- Replies: 6
- Views: 2099
- by EricLien9122
Sat Nov 15, 2008 11:15 pm- Forum: Reading Comprehension
- Topic: Common GMAT passage structures
- Replies: 3
- Views: 3989
This is an experiment type question. The experiment usually assume their "data" or result is representative. The conclusion: A with classic: cried less, fewer ailments, and more weights than B with rock music. In answer E, does it matter if music were play at different time? The experiment...
- by EricLien9122
Sat Nov 15, 2008 10:58 pm- Forum: Critical Reasoning
- Topic: Music
- Replies: 6
- Views: 3446
B: 3
G: 4
(3x+5)/4x=1
x=5
5(4)=20
The trick is adding 5 to the boys in order to maintain a 1 to 1 ratio.
I hope this makes sense, please correct me if I made a mistake.
- by EricLien9122
Fri Nov 14, 2008 1:14 pm- Forum: Problem Solving
- Topic: Question 5 (nov.14th)
- Replies: 2
- Views: 1089
- by EricLien9122
Fri Nov 14, 2008 1:03 pm- Forum: Data Sufficiency
- Topic: Another Question
- Replies: 7
- Views: 1821
- by EricLien9122
Fri Nov 14, 2008 12:50 pm- Forum: Problem Solving
- Topic: Question 2 (Nov.14)
- Replies: 4
- Views: 4486
Hey Ron, thanks for the amazing explanation, but I am still not sure if C is sufficient, because the neither statement stated that the "middle" number is equal to 1000. So...we can have -20,-10, 9999, 10000, 10001 median=9999 we also can have... -20,-10,1000,1001,1002 median=1000 Since we ...
- by EricLien9122
Fri Nov 14, 2008 11:49 am- Forum: Data Sufficiency
- Topic: Median
- Replies: 17
- Views: 3574
pass Not pass A: 20 10 B: 17 13 C: 15 15 So, we know at least 15 teachers failed the test. Since the question didn't tell us any relationship between A, B and C, and asked about how many at least passed (minimum value), we have to assume the worst possible situation. C failed 15, A and B failed 15 t...
- by EricLien9122
Fri Nov 14, 2008 10:47 am- Forum: Problem Solving
- Topic: Sets - confusing OA
- Replies: 6
- Views: 1680