## Search found 57 matches

- by ellexay

Thu Feb 12, 2009 3:58 am- Forum: Problem Solving
- Topic: Relatively simple "combination"
- Replies:
**3** - Views:
**1095**

- by ellexay

Wed Feb 11, 2009 6:17 pm- Forum: Problem Solving
- Topic: what is sqrt(7+sqrt29) * sqrt(7-sqrt29)??
- Replies:
**3** - Views:
**3512**

Isn't the formula for remainder questions:

Divisor = Dividend*Quotient + Remainder?

Excuse the terms I wrote if they are not accurate, but you get the idea if you plug the formula in for this problem.

I hope this helps.

- by ellexay

Wed Feb 11, 2009 6:10 pm- Forum: Problem Solving
- Topic: OG Quantitative Q. 60
- Replies:
**3** - Views:
**1533**

I don't know if this is just coincidence, but I actually got the answer this way - 198/3 = 66 (i chose 198 because it's the first number counting down from 200 that's divisible by 3) 66/2 = 33 (i figure that half of those 66 numbers will be divisible by 3). Can someone verify whether this is a coinc...

- by ellexay

Wed Feb 11, 2009 5:44 pm- Forum: Problem Solving
- Topic: PS1000 Sec1 Q10
- Replies:
**5** - Views:
**1374**

- by ellexay

Wed Feb 11, 2009 5:41 pm- Forum: Problem Solving
- Topic: 105 hand-shakes
- Replies:
**5** - Views:
**11816**

##### Averages?!

What was Adrian’s average percentage in the last 2 tests? 1. His average for the last 3 tests is 80%. 2. He got 70% on his first test and 80% on his second test. • A • B • C • D • E (correct answer) Feedback: Statement (1) gives us insufficient data as it gives the average percentage for 3 tests. It...

- by ellexay

Wed Feb 11, 2009 5:02 pm- Forum: Data Sufficiency
- Topic: Averages?!
- Replies:
**4** - Views:
**1068**

##### Relatively simple "combination"

In a classroom, there are 6 students. We need to divide them into 3 pairs for the purpose of assigning homework. In how many ways can be make such pairs? • 5 • 6 • 15 (correct answer) • 24 • 36 Feedback: Assume that the students are named A, B, C, D, E, and F. Let us begin with A. She can be paired ...

- by ellexay

Wed Feb 11, 2009 4:51 pm- Forum: Problem Solving
- Topic: Relatively simple "combination"
- Replies:
**3** - Views:
**1095**

Sometimes, when I am in the same situation, I try to match up some of the words in the passage to certain words in answer choices. I try to look at the passage as a big mathematical formula, and the answer choices as things that can either fit in with it or leave it lacking. Hope this doesn't sound ...

- by ellexay

Wed Feb 11, 2009 2:16 pm- Forum: GMAT Strategy
- Topic: what to do when you don't understand a RC passage
- Replies:
**6** - Views:
**2540**

- by ellexay

Wed Feb 11, 2009 2:03 pm- Forum: Problem Solving
- Topic: Factorials versus Multiplication
- Replies:
**3** - Views:
**1572**

##### Number properties + probability

) If one number is chosen at random from the first 1000 positive integers, what is the probability that the number chosen is multiple of both 2 and 8? Soln: Any multiple of 8 is also a multiple of 2 so we need to find the multiples of 8 from 0 to 1000 the first one is 8 and the last one is 1000 ==> ...

- by ellexay

Wed Feb 11, 2009 7:23 am- Forum: Problem Solving
- Topic: Number properties + probability
- Replies:
**3** - Views:
**3683**

##### Combinations - somewhat tricky

A committee of 6 is chosen from 8 men and 5 women so as to contain at least 2 men and 3 women. How many different committees could be formed if two of the men refuse to serve together?

(A) 3510

(B) 2620

(C) 1404

(D) 700

(E) 635

ANS - (E)

- by ellexay

Wed Feb 11, 2009 7:03 am- Forum: Problem Solving
- Topic: Combinations - somewhat tricky
- Replies:
**1** - Views:
**873**

##### Factorials versus Multiplication

If the first digit cannot be a 0 or a 5, how many five-digit odd numbers are there? A. 42,500 B. 37,500 C. 45,000 D. 40,000 E. 50,000 Soln: This problem can be solved with the Multiplication Principle. The Multiplication Principle tells us that the number of ways independent events can occur togethe...

- by ellexay

Wed Feb 11, 2009 6:53 am- Forum: Problem Solving
- Topic: Factorials versus Multiplication
- Replies:
**3** - Views:
**1572**

- by ellexay

Wed Feb 11, 2009 6:22 am- Forum: Problem Solving
- Topic: Which must be true? (prime integers)
- Replies:
**4** - Views:
**970**

Thanks to all! I understand now.

Unfortunately, the source from which I got this problem didn't have the OA for this one =(

- by ellexay

Wed Feb 11, 2009 6:19 am- Forum: Problem Solving
- Topic: Number properties
- Replies:
**8** - Views:
**1173**

You're looking for a reason to doubt the proposed link between (a) consumers caring about the environment and (b) the resulting increase in smaller/different packaging found in stores. Thus, D. This answer proposes a strong *alternative* explanation by saying that the main reason for the smaller pac...

- by ellexay

Tue Feb 10, 2009 6:12 pm- Forum: Critical Reasoning
- Topic: Wasteful Packaging
- Replies:
**6** - Views:
**2831**