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punyadeep
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pls explain this too...?? so much confused 09 Mar 2011, 04:29
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can someone pls explain this concept..?
what do we mean by order does matter and order does not matter...??
for eg..) if we need to know the seating arrangement for 4 persons from 7 chairs,,,we take order matters and if we need to make a team of 4 people from 7 people in a room we take order not matters....??

or is there a better method to identify when order matters and when order does not matters...??



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pls explain this too...?? so much confused 09 Mar 2011, 04:46
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There is a group of 7 people and 4 chairs are available. You want to seat 4, then the order matters
First chair can be filled in 7 ways
Second chair can be filled in 6 ways
Third chair can be filled in 5 ways
Fourth chair can be filled in 4 ways
Total ways = 7 * 6 * 5 * 4

On the other hand, if you are making a team of 4 from a group of 7, order does not matters. Its 7C4
A = First person can be chosen in 7 ways
B = Second person - 6 ways
C = Third person - 5 ways
D = Fourth person - 4 ways

But ABCD = BCDA = CDAB = DABA ..... etc
So you have duplicates. There will be 4! duplicates per selection

To make unique teams, you will have to divide by 4!
Hence no of ways = 7 * 6 * 5 * 4 / (4!) = 7C4

punyadeep
can someone pls explain this concept..?
what do we mean by order does matter and order does not matter...??
for eg..) if we need to know the seating arrangement for 4 persons from 7 chairs,,,we take order matters and if we need to make a team of 4 people from 7 people in a room we take order not matters....??

or is there a better method to identify when order matters and when order does not matters...??
Show more



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!