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These are relatively simple problems. Despite my ability to

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CEO
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These are relatively simple problems. Despite my ability to [#permalink] New post 21 Sep 2007, 18:21
These are relatively simple problems.

Despite my ability to solve most combinations problems I still can't quite grasp this fundamental aspect of combinatorics questions.

Essentially when Does order matter and when does it NOT matter?


Ex/ If there are 7 people in a room, but only 4 chairs available, how many different seating arrangements are possible?


Ex2/ If a team of 4 people is to be chosen from 7 people in a room, how many different teams are possible?


I know what to do for these two problems, so please don't just give the solutions for these. Explain Why one has to be one way and the other a different way.


If I ever get Ex2 I know exactly what to do. Anything with "team" I know exactly what to do.

Ex 1/ however, I wouldn't always know to solve by doing 7!/3!.


Thanks
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 [#permalink] New post 22 Sep 2007, 02:21
just keep in mind dis thing

wen der is arrangement of chairs, alphabets etc its a problem of permutation
n
wen v hav to select from group of ppl, no. of balls etc its a problem on combination

Ex1 says dat v need to arrange 7 ppl in 4 chairs so dat'll b 7P4

Ex2 says v need to select 4 ppl from 7 so dat'll b 7C4

remember-- for permutation problems always use 'P' n for combination problems always use 'C' i guess dat'll b simple to remember

so u can try it out on any problem
for ex. 2 cards r to be selected out of the deck so that both of dem r of hearts
here imp word is 'select' d moment u c dis word u shud know dat dis problem is of selection hence use 'C' so it'll b 13c2/52c2

hope dis little piece of advice helps :)
  [#permalink] 22 Sep 2007, 02:21
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These are relatively simple problems. Despite my ability to

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