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subhashghosh
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
55%
(hard)
Question Stats:
55% (01:15) correct
45%
(01:29)
wrong
based on 485
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Find the number of ways in which four men, two women and a child can sit at a round table if the child is seated between two women.
A. 24
B. 36
C. 48
D. 120
E. 240
A. 24
B. 36
C. 48
D. 120
E. 240
subhashghosh
Note:
The number of arrangements of n distinct objects in a row is given by \(n!\).
The number of arrangements of n distinct objects in a circle is given by \((n-1)!\).
We have M, M, M, M, W, W, C --> glue two women and the child so that they become one unit and the child is between women: {WCW}. Now, these 5 units: {M}, {M}, {M}, {M}, {WCW} can be arranged around the table in (5-1)!=4! ways and the women within their unit can be arranged in 2 ways {W1, C, W2} or {W2, C, W1} so total # of arrangement is 4!*2=48.
Answer: 48.
240 would be the answer if the arrangement were in a row: {M}, {M}, {M}, {M}, {WCW} can be arranged in a row in 5! ways and the women within their unit can be arranged in 2 ways {W1, C, W2} or {W2, C, W1} so total # of arrangement is 5!*2=240.
P.S. Please read and follow: how-to-improve-the-forum-search-function-for-others-99451.html
So please provide answer choices for PS questions.
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General Discussion
subhashghosh
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Hi
Thanks for your reply. And I did not have the answer, so could not post it, apologies.
One question, if the places in table are numbered, wouldn't it become a case like arranging the members in the stated manner in a line, in which case the answer 240 is valid ?
Regards,
Subhash
Thanks for your reply. And I did not have the answer, so could not post it, apologies.
One question, if the places in table are numbered, wouldn't it become a case like arranging the members in the stated manner in a line, in which case the answer 240 is valid ?
Regards,
Subhash
subhashghosh
If the chairs are numbered and one specific arrangement and the same arrangement but shifted by one position are considered different then the answer will simply be 48*7.
That's because the difference between placement in a row and that in a circle is following: if we shift all object by one position, we will get different arrangement in a row but the same relative arrangement in a circle.
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Bunuel
For this szenario I received 744 different cases, including the cases when the child and a man or men are between the 2 women.
{M}, {M}, {M},{WCMW} 4*3*2*2*2=96
{M}, {M},{WCMMW} 3*2*3*2=72
{M},{WCMMMW}2*4*3*2*2=96
{WCMMMMW}5*4*3*2*2=240
These possibilities together with Bunuels possibilities when only the child is btw the women {WCW} gives 504+240=744
Please correct me if I am wrong!
medanova
I think the question means that ONLY the child must be between two women.
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Ok, I see.
If the question were stated for a row and not a table, and if there was the ONLY requirement, would that be correct?
If the question were stated for a row and not a table, and if there was the ONLY requirement, would that be correct?
medanova
If... If... This question is already not a GMAT type...
But anyway your solution is still wrong:
{M}, {M}, {M}, {M}, {WCW}: 5!*2=240;
{M}, {M}, {M}, {WCMW}: 4!*4C1*2!*2;
{M}, {M}, {WCMMW}: 3!*4C2*3!*2;
{M}, {WCMMMW}: 2!*4C3*4!*2;
{WCMMMMW}: 5!*2.
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Another great explanation. Thank you Bunuel
Bunuel
Another way to look at the question.
(though let me point out first that the question doesn't specifically say 'circular table'. It just says 'sit at a table'. If it is a rectangular table, perhaps there are 4 chairs on one side, 3 on the other etc. Since you mentioned "Circular Permutation Problem" in the subject line, I am assuming it is meant to be a circular table.)
7 seats around a circular table, 7 people.
First I make the child sit anywhere in 1 way since all seats are the same. The two women can sit around him in 2! ways. Now 4 seats are left for 4 men and they can occupy them in 4! ways.
Total number of ways = 4!*2! = 48
Another thing, if the places are numbered, say 1, 2, 3 etc for the 7 seats, the number of arrangements will be 7*2!*4! = 336.
Make the child sit on any one of the 7 seats since all are unique now. The women sit around the child in 2! ways and the men sit on the rest of the 4 seats in 4! ways.
The reason why this number is greater than the number of arrangements in case of a row (240 ways) is because in a row, child cannot be in 1st or 7th position while in a circle, the child can sit on seat no 1 or seat no 7. So we have 2*2!*4! = 96 extra cases in case of numbered seats around a circular table.
Note: 240 + 96 = 336
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(though let me point out first that the question doesn't specifically say 'circular table'. It just says 'sit at a table'. If it is a rectangular table, perhaps there are 4 chairs on one side, 3 on the other etc. Since you mentioned "Circular Permutation Problem" in the subject line, I am assuming it is meant to be a circular table.)
7 seats around a circular table, 7 people.
First I make the child sit anywhere in 1 way since all seats are the same. The two women can sit around him in 2! ways. Now 4 seats are left for 4 men and they can occupy them in 4! ways.
Total number of ways = 4!*2! = 48
Another thing, if the places are numbered, say 1, 2, 3 etc for the 7 seats, the number of arrangements will be 7*2!*4! = 336.
Make the child sit on any one of the 7 seats since all are unique now. The women sit around the child in 2! ways and the men sit on the rest of the 4 seats in 4! ways.
The reason why this number is greater than the number of arrangements in case of a row (240 ways) is because in a row, child cannot be in 1st or 7th position while in a circle, the child can sit on seat no 1 or seat no 7. So we have 2*2!*4! = 96 extra cases in case of numbered seats around a circular table.
Note: 240 + 96 = 336
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Treat the women and child as a unit.
W C W
So in total there are (5-1)! = 24 ways for arrangement
24 x 2 = 48 <---- Women can swap places with respect to the child
Answer is 48.
W C W
So in total there are (5-1)! = 24 ways for arrangement
24 x 2 = 48 <---- Women can swap places with respect to the child
Answer is 48.
Bunuel
Bunuel question should say whether it is round table or rectangle table!! Or in exam if we see a question regarding table, it would be round table only? We have to assume it?
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Vibhatu
A proper question will specify what type of table.
This is not a proper question.
Posts: 2
I feel like this question should really say sit *around* a table to make it clear. It could be a counter where everyone is facing the same direction. Poorly worded imo
The correct answer assumes the table is circular or they are they are sitting around the table. Is this an official question?
sam3423
No, this is not an official question. Yes, the question assumes the table is circular.
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