Search found 57 matches

by ellexay

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

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

Suresh,

How did you find out the value of N in NC2=105? Is there a formula?

Thanks!

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

Unfortunately, I could not access the OA for this one. I did think it was (A) though. Thanks!!!

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