Search found 76 matches


Sorry for the delay with OA. I didn't get an email for some reason.

Any way, Sanjana is correct. It is 100.

by mpaudena

Tue Oct 20, 2009 1:37 pm
Forum: Problem Solving
Topic: Combinatorics
Replies: 9
Views: 1578

Combinatorics

A certain law firm consists of 4 senior partners and 6 junior partners. How many different groups of 3 partners can be formed in which at least one member of the group is a senior partner? (Two groups are considered different if at least one group member is different.) Answer and explanation please....

by mpaudena

Mon Oct 19, 2009 10:50 pm
Forum: Problem Solving
Topic: Combinatorics
Replies: 9
Views: 1578

GMATPrep Sequence and Interest Problem

For every integer k from 1 to 10, inclusive, the kth term of a certain sequence is given by (-1)^(k+1) * 1/2^k. If T is the sum of the first 10 terms in the sequence, then T is A) greater than 2 B) between 1 and 2 C) between 1/2 and 1 D) between 1/4 and 1/2 E) less than 1/4 (in the 1/2^k only the 2 ...

by mpaudena

Mon Oct 19, 2009 5:59 pm
Forum: Problem Solving
Topic: GMATPrep Sequence and Interest Problem
Replies: 2
Views: 1034

oh well! 15+12 is 27 not 37! GMAT prep is never wrong. :wink: When u use a^2 - b^2 u will get (1000+1+1000-1)(1000+1-1000+1) ------------------------------ (100+1+100-1)(100+1-100+1) =2000*2 ------ 200*2 =10 Sanja, I do appreciate your help. I'm wondering how I can get my mind to start seeing these...

by mpaudena

Thu Oct 15, 2009 6:48 am
Forum: Problem Solving
Topic: GMATPrep Help
Replies: 6
Views: 1723

1) Write 1001 as 1000+1 999 as 1000-1 101 as 100+1 99 as 100-1 and then use a^2-B^2 = a+b * a-b 2)Write 4^17 as 2^34 and then the expression becomes 2^28(2^6-1) 2^18 * 63 =2^18 * 3 * 3 * 7 Hence 7 as it is the largest of 2,3,7. 3) Either 1Kind of cheese and 1 kind of fruit OR 2 kinds of cheese and ...

by mpaudena

Thu Oct 15, 2009 6:08 am
Forum: Problem Solving
Topic: GMATPrep Help
Replies: 6
Views: 1723

1) Write 1001 as 1000+1 999 as 1000-1 101 as 100+1 99 as 100-1 and then use a^2-B^2 = a+b * a-b 2)Write 4^17 as 2^34 and then the expression becomes 2^28(2^6-1) 2^18 * 63 =2^18 * 3 * 3 * 7 Hence 7 as it is the largest of 2,3,7. 3) Either 1Kind of cheese and 1 kind of fruit OR 2 kinds of cheese and ...

by mpaudena

Wed Oct 14, 2009 11:22 pm
Forum: Problem Solving
Topic: GMATPrep Help
Replies: 6
Views: 1723

Re: GMAC Work Problem

Machine A produces pencils at a constant rate of 9000 pencils per hour and machine B produces pencils at a constant rate of 7000 pencils per hour. If the two machines together must produce 100000 pencils and if each machine can operate for at most 8 hours. What is the least amount of time in hours ...

by mpaudena

Wed Oct 14, 2009 8:57 pm
Forum: Problem Solving
Topic: GMAC Work Problem
Replies: 4
Views: 3426

GMATPrep Question

How much time did it take a certain car to travel 400 kilometers? (1) The car traveled the first 200 kilometers in 2.5 hours. (2) If the car's average speed had been 20 kilometers per hour greater than it was, it would have traveled the 400 kilometers in 1 hour less ime Han it did. The answer is B, ...

by mpaudena

Wed Oct 14, 2009 6:10 pm
Forum: Data Sufficiency
Topic: GMATPrep Question
Replies: 1
Views: 975

GMATPrep Help

(1001^2 - 999^2)/(101^2 - 99^2) = also What is the greatest prime factor of 4^17 - 2^28? also A certain restaurant offers 6 kinds of cheese and 2 kinds of fruit for its dessert platter. If each dessert platter contains an equal number of kinds of cheese and kinds of fruit, how many different dessert...

by mpaudena

Wed Oct 14, 2009 4:23 pm
Forum: Problem Solving
Topic: GMATPrep Help
Replies: 6
Views: 1723

Ans should be 84 as no seq is mentioned so u have start as table is given. i.e 96 $ for 4 days and then 84$ fo 7 days and blah -2 now the median of 20 terms would be avg of 10 & 11 term, as in 10 th day - 84 $ 11 th day - 84 $ taking avg comes out to be 84 $ so ans is 84 $(took me less than 10 ...

by mpaudena

Wed Oct 14, 2009 6:13 am
Forum: Problem Solving
Topic: GMATPrep PS Question with Table
Replies: 5
Views: 2769

Re: Please provide explanation for these GMAT PREP Questions

2. Angela’s grade was in the 90th percentile out of 80 grades in her class. In another class there were 19 grades higher than Angela’s. If nobody had Angela’s grade, then Angela was what percentile of the two classes combined? a. 72 b. 80 c. 81 d. 85 e. 92 Regards I've seen question number 2 ...

by mpaudena

Mon Oct 12, 2009 6:14 pm
Forum: Problem Solving
Topic: Please provide explanation for these GMAT PREP Questions
Replies: 5
Views: 2586

It takes less than ten seconds to solve this problem only if you know the concept of "median". So don't worry about it when you come across this type of question afterwards. What is the median of 20days? Yes, 10 days. So, find the 10 days that falls on the range. That is second one, 7(bec...

by mpaudena

Mon Oct 12, 2009 4:03 pm
Forum: Problem Solving
Topic: GMATPrep PS Question with Table
Replies: 5
Views: 2769

GMATPrep PS Question with Table

Okay, there is a table and the info is as such: Amount earned per day: $96 -- $84 -- $80 -- $70 -- $48 Number of days: 4 -- 7 -- 4 -- 3 -- 2 A student worked for 20 days. For each of the amounts shown in the first row of the table, the second row gives the number of days that the student earned that...

by mpaudena

Mon Oct 12, 2009 12:41 pm
Forum: Problem Solving
Topic: GMATPrep PS Question with Table
Replies: 5
Views: 2769

GMATPrep DS Question

Is the hundredths digit of decimal d greater than 5?

(1) The tenths digit of 10d is 7.

(2) The thousandths digit of of d/10 is 7.

The software says D and I say E is the answer. Please explain why the software is correct? Thanks.

by mpaudena

Mon Sep 28, 2009 1:16 pm
Forum: Data Sufficiency
Topic: GMATPrep DS Question
Replies: 1
Views: 1086

Power Prep Exponent Questions

The value of (10^8 - 10^2)/(10^7 - 10^3)is closest to which of the following?

A) 1

B) 10

C) 10^2

D) 10^3

E) 10^4

Thanks.

by mpaudena

Sat Sep 19, 2009 5:09 am
Forum: Problem Solving
Topic: Power Prep Exponent Questions
Replies: 10
Views: 1785