## Search found 24 matches

##### 80% choose course M and C.....

80% choose course M and course C....., how many people choose neither M nor C?

1. 50% choose M

2. 30% choose C but not M

How do we answer this question by drawing a draft? or is there any quicker way to do it?

- by neilcao

Tue Feb 22, 2011 7:41 am- Forum: Data Sufficiency
- Topic: 80% choose course M and C.....
- Replies:
**2** - Views:
**606**

##### About remainder, Help

10/2^n find the remainder?

1. n is even number

2. n is multiples of 4

how do we deal with this kind of remainder questions, when something is like 10/2^n or maybe 12/4^n....

- by neilcao

Tue Feb 22, 2011 7:10 am- Forum: Data Sufficiency
- Topic: About remainder, Help
- Replies:
**6** - Views:
**880**

##### Probability question

Two independent events, the probability of any of them to occur is P, what's the probability that one happens and the other not. (expressed in terms of p)

Could this be 2pï¼ˆ1-pï¼‰? Why is that?

- by neilcao

Tue Feb 22, 2011 6:43 am- Forum: Problem Solving
- Topic: Probability question
- Replies:
**1** - Views:
**630**

- by neilcao

Mon Feb 21, 2011 7:47 am- Forum: Data Sufficiency
- Topic: Is H a prime number
- Replies:
**4** - Views:
**979**

##### Bank interest rate questions

2% compound interestï¼Œno money put in and out in 10 yearsï¼Œthe interests for two years is 5050, what's the original amount of money

- by neilcao

Mon Feb 21, 2011 7:23 am- Forum: Problem Solving
- Topic: Bank interest rate questions
- Replies:
**3** - Views:
**931**

##### A number is the product of x numbers,

a number is the product of x numbers, when the number's last 6 digits are 0 (000000), what\s the least value of x?

we are talking about integers here.

- by neilcao

Mon Feb 21, 2011 7:14 am- Forum: Problem Solving
- Topic: A number is the product of x numbers,
- Replies:
**3** - Views:
**785**

##### problem 80 drinks given to a group of people

80 bottles of drink are given to a group of people, the remaining number of drinks is 4 less than the number given to each person, which number cannot be the actual number of people in this group?

21 28 14 17 24

Suppose the total number of drinks is given evenly to each person

- by neilcao

Mon Feb 21, 2011 6:55 am- Forum: Problem Solving
- Topic: problem 80 drinks given to a group of people
- Replies:
**3** - Views:
**989**

##### Last digit of (27145)* (10^11-10^10)/10^13

(27145)* (10^11-10^10)/10^13

what's the last digit of the result?

I assume the result is not a integer

- by neilcao

Mon Feb 21, 2011 6:21 am- Forum: Problem Solving
- Topic: Last digit of (27145)* (10^11-10^10)/10^13
- Replies:
**1** - Views:
**666**

##### how do you solve this kind of questions between 100-999....

between 100-999, how many number can be divided by 2, or multiples of 2 ?

Thanks

- by neilcao

Mon Feb 21, 2011 5:07 am- Forum: Problem Solving
- Topic: how do you solve this kind of questions between 100-999....
- Replies:
**3** - Views:
**11657**

##### About remainder question

Maybe a poor example, some questions like this say: (7^243)+(7^22)-5 divided by 7, what is the remainder?

How to solve this kind of problem?

Thanks

- by neilcao

Tue Feb 08, 2011 8:12 pm- Forum: Problem Solving
- Topic: About remainder question
- Replies:
**3** - Views:
**1024**

Sorry already posted it again in PS: http://www.beatthegmat.com/sequence-pro ... tml#338264towerSpider wrote:this is ds forum. post it in ps.

- by neilcao

Mon Feb 07, 2011 7:42 pm- Forum: Data Sufficiency
- Topic: Sequence problem, a1, a2,..an
- Replies:
**2** - Views:
**715**

##### Sequence problem, a1, a2,..an....

The sequence a1, a2,....an,.../ is such that an=4an-1 - 3,for all integers n>1. If ac=x, then a1=?

A. 4x-3

B. 16x-15

C. X+3/4

D. X+3/16

E. X+15/16

Is there any quick way to solve this problem?

Thanks

- by neilcao

Mon Feb 07, 2011 7:40 pm- Forum: Problem Solving
- Topic: Sequence problem, a1, a2,..an....
- Replies:
**1** - Views:
**1980**

##### Sequence problem, a1, a2,..an

The sequence a1, a2,....an,.../ is such that an=4an-1 - 3,for all integers n>1. If ac=x, then a1=?

A. 4x-3

B. 16x-15

C. X+3/4

D. X+3/16

E. X+15/16

Is there any quick way to solve this problem?

Thanks

- by neilcao

Mon Feb 07, 2011 8:39 am- Forum: Data Sufficiency
- Topic: Sequence problem, a1, a2,..an
- Replies:
**2** - Views:
**715**

##### Ten DS questions for discussion today

Q1.the tens digit of number N? D1. 10n hundreds digit is 2. D2. n-9 tens digit is 1. Q2. Someon is making a cake. Part of the cake is given to his company, and another part is given to his neighbor, he keeps the remaining part. Is the part he keeps 1/3 of the total? D1. The part he keeps is less tha...

- by neilcao

Sat Jan 29, 2011 2:05 am- Forum: Data Sufficiency
- Topic: Ten DS questions for discussion today
- Replies:
**1** - Views:
**624**

##### Ten PS questions for discussion today

Q1.ï¼ˆ4.32ï¼‰*10^(-4) hundred thousandth? Q2. If S(N)=1+2+3...+N, find S(2N)-S(N)? Q3. Liquid A contains 25% of waterï¼ŒB 55%ï¼Œwhen add A and B, the total volume is 300Lï¼Œwater is 35%, find B's volume? Q4. Out of 64 peopleï¼Œ5 speaks Germanï¼Œ6 speaks Englishï¼Œ10 speaks Frenceï¼Œeveryone speaks a...

- by neilcao

Sat Jan 29, 2011 1:33 am- Forum: GMAT Math
- Topic: Ten PS questions for discussion today
- Replies:
**3** - Views:
**1051**