Events & Promotions
|
|
GMAT Club Daily Prep
Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.
Customized
for You
Track
Your Progress
Practice
Pays
Not interested in getting valuable practice questions and articles delivered to your email? No problem, unsubscribe here.
Jun 0408:30 AM PDT
-09:30 AM PDT
For most test takers, Data Insights is the most challenging section on the GMAT, with test takers scoring several points lower on average on DI than on Quant or Verbal and completing the section with less time to spare.
May 2910:00 AM IST
-11:00 PM IST
Start your journey with a fully customized action plan and work with a dedicated mentor to achieve a 735+ score.- Jun 03
08:30 AM PDT
-09:30 AM PDT
In Episode 7 of our GMAT Ninja CR series, we are rounding up the oddballs, the misfits, and the format-benders: EXCEPT, Fill-In-The-Blanks, and other unusual Critical Reasoning question types. When you see a question that ends with a literal blank line - Jun 10
06:00 AM PDT
-06:15 PM PDT
Register for the GMAT Club Virtual MBA Spotlight Fair – the world’s premier event for serious MBA candidates. This is your chance to hear directly from Admissions Directors at nearly every Top 30 MBA program..
Hi
Here i will show you some examples first:
from ABCD, we got different variations as:
AB, AC, AD, BC, BD and CD
for which N!/((N-R!)*R!) is the formula for above
from ABC we got different variations as:
ABC, ACB, BCA, CBA, BAC and CAB
for which 3! is the formula for above
Here what i don't know what formula to apply for:
from g and b:
gbb,ggb,ggg,bgg,bbg,bbb,gbg and bgb
Here i will show you some examples first:
from ABCD, we got different variations as:
AB, AC, AD, BC, BD and CD
for which N!/((N-R!)*R!) is the formula for above
from ABC we got different variations as:
ABC, ACB, BCA, CBA, BAC and CAB
for which 3! is the formula for above
Here what i don't know what formula to apply for:
from g and b:
gbb,ggb,ggg,bgg,bbg,bbb,gbg and bgb
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block below for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
13 Oct 2015, 20:37
Kudos
Bookmarks
Hi sanemask,
GMAT questions are always carefully worded so that you (as the Test Taker) can determine what the question is asking you to solve for (so you have to think about what information the prompt gives you AND what the specific question asks you for).
In your first example, you're solving for the number of different COMBINATIONS of 2 items from a total of 4 items (so you use the combination formula).
In your second example, you're solving for the number of different ARRANGEMENTS of 3 different items (so you can use a factorial or the permutation formula).
Your third example is about the number of different ARRANGEMENTS WITH DUPLICATES allowed. Since each of the 3 "spots" can be either a "B" or a "G", there are 2^3 possible arrangements.
GMAT assassins aren't born, they're made,
Rich
GMAT questions are always carefully worded so that you (as the Test Taker) can determine what the question is asking you to solve for (so you have to think about what information the prompt gives you AND what the specific question asks you for).
In your first example, you're solving for the number of different COMBINATIONS of 2 items from a total of 4 items (so you use the combination formula).
In your second example, you're solving for the number of different ARRANGEMENTS of 3 different items (so you can use a factorial or the permutation formula).
Your third example is about the number of different ARRANGEMENTS WITH DUPLICATES allowed. Since each of the 3 "spots" can be either a "B" or a "G", there are 2^3 possible arrangements.
GMAT assassins aren't born, they're made,
Rich
13 Oct 2015, 23:47
Kudos
Bookmarks
sanemask
I would recommend that you understand the basis of all these permutations and combination formulas and how they relate to the fundamental counting principal. It is rare that the formula alone would be sufficient for the GMAT, the test writers like to test the understanding of the concepts.
Dabral
I would recommend that you understand the basis of all these permutations and combination formulas and how they relate to the fundamental counting principal. It is rare that the formula alone would be sufficient for the GMAT, the test writers like to test the understanding of the concepts.
Dabral
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
