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permutation problem on GMAT Prep
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krishna239455
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Permutation problem. Seems to be difficult pls help.
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GMATGuruNY
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This question is about circular permutations.
VERY quick if we know the formula.
I posted an explanation here:
https://www.beatthegmat.com/gmat-prep-se ... 68201.html
VERY quick if we know the formula.
I posted an explanation here:
https://www.beatthegmat.com/gmat-prep-se ... 68201.html
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krishna239455
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Anurag@Gurome
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For circular seating arrangement, the number of arrangements of n distinct objects in a row is given by n!.krishna239455 wrote:Permutation problem. Seems to be difficult pls help.
Number of arrangements of n distinct objects in a circle is given by (n - 1)!.
So, in this the total number of different possible seating arrangements for the group = (5 - 1)! = 4! = 4 * 3 * 2 * 1 = 24 ways
The correct answer is C.
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The formula for circular seating arrangement is (n-1)! and so it comes down to 4! i.e 24 and the correct answer is C.
Hope this helps.
Hope this helps.
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The funda or the logic behind the circular reasoning is very simple and can be compared to the linear arrangement. in a linear seating arrangement, the arraengements can be very different and the base is taken as the seat no. occupied by the individual.
But in a circular seating arrangement, the seat number can change because of the circular arrangement but the seating arrangement is based on the relative seating arrangement. So in circular seating arrangement you have to take 1 person among the people given as the base and so 1 person's probability of taking a seat is fixed. And the other people relative to that person's probability is considered...
This is extremely easy to understand when you have a diagram in front of you...
I hope this post helped...
But in a circular seating arrangement, the seat number can change because of the circular arrangement but the seating arrangement is based on the relative seating arrangement. So in circular seating arrangement you have to take 1 person among the people given as the base and so 1 person's probability of taking a seat is fixed. And the other people relative to that person's probability is considered...
This is extremely easy to understand when you have a diagram in front of you...
I hope this post helped...
IT IS TIME TO BEAT THE GMAT
LEARNING, APPLICATION AND TIMING IS THE FACT OF GMAT AND LIFE AS WELL... KEEP PLAYING!!!
Whenever you feel that my post really helped you to learn something new, please press on the 'THANK' button.
LEARNING, APPLICATION AND TIMING IS THE FACT OF GMAT AND LIFE AS WELL... KEEP PLAYING!!!
Whenever you feel that my post really helped you to learn something new, please press on the 'THANK' button.
