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just4u1530
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perm n comb question 10 Oct 2007, 12:49
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Dear friends

I'm really bad at P n C..could you pls help me with an absolute "sitter".

10 paintings have to be arranged at 4 places. In How many ways it is possible?

Thanks



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Ravshonbek
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perm n comb question 10 Oct 2007, 12:51
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just4u1530
Dear friends

I'm really bad at P n C..could you pls help me with an absolute "sitter".

10 paintings have to be arranged at 4 places. In How many ways it is possible?

Thanks
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me too
detailed explanations please
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beckee529
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perm n comb question 10 Oct 2007, 12:54
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just4u1530
Dear friends

I'm really bad at P n C..could you pls help me with an absolute "sitter".

10 paintings have to be arranged at 4 places. In How many ways it is possible?

Thanks
Show more


i am pretty weak at P&C as well. but i'll take a shot at it.. any other insight would be highly appreciated :)

10 paintings have to be arranged at 4 places. In How many ways it is possible?

since, they are talking about arrangement, order is important, so we must use permutation:

10P4 = 10*9*8*7 = 5,040 ways?
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nyctown
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perm n comb question 10 Oct 2007, 13:36
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beckee529
just4u1530
Dear friends

I'm really bad at P n C..could you pls help me with an absolute "sitter".

10 paintings have to be arranged at 4 places. In How many ways it is possible?

Thanks

i am pretty weak at P&C as well. but i'll take a shot at it.. any other insight would be highly appreciated :)

10 paintings have to be arranged at 4 places. In How many ways it is possible?

since, they are talking about arrangement, order is important, so we must use permutation:

10P4 = 10*9*8*7 = 5,040 ways?
Show more


I agree.

Permutation=order matters and each combination is different from the other.

In this problem the keyword is "PLACES". this means that each has it's own location. If we were to put them in bag, the order wouldnt matter anymore.

Hope this helps.
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nyctown
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perm n comb question 10 Oct 2007, 13:49
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https://www.gmatclub.com/forum/t10838

Has good links with answers on Perm/Comb
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perm n comb question 10 Oct 2007, 13:56
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just4u1530
Dear friends

I'm really bad at P n C..could you pls help me with an absolute "sitter".

10 paintings have to be arranged at 4 places. In How many ways it is possible?

Thanks
Show more

let me explain u wid simple logic..

u have 4 places and 10 paintings..

__ __ __ __

for d first place u hav to choose from 10 paintings..u can either choose 2 or 5 or 7etc..so u have 10 options

since u hav selected 1 of d 10 paintings for d first place u r left wid 9 paintings..so again u hav 9 options

now u hav selected 2 of d 10 paintings u r left wid 8 paintings..so for d third place u have 8 options

now 3 of d 10 paintings r gone..so remaining 7 for d fourth place..so u have 7 options to select

finally wen u sum up..count d no. of options u hav i.e. 10x9x8x7 dats ur ans...hope this helps..:)



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!