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#1 2006-11-15 04:18:55

Neha
Member
Registered: 2006-10-11
Posts: 173

chosen

three students must be chosen to serve on a panel out of a class of 12 students . in how many different ways can they be chosen?

well 12 students in total
1 2 3 4 5 6 7 8 9 10 11 12
3 must be chosen
so it can be
123
456
789
10 11 12
or
234
567
89 10
11 12 1
or
345
678
9 10 11
12 1 2

correct
so there are  12 waysdownup


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#2 2006-11-15 04:47:43

Talvon
Member
Registered: 2006-11-15
Posts: 16

Re: chosen

What about 235, 236 etc and all other combinations?

Sorry I don't know the formulas, I never did stats, something to think about tongue

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#3 2006-11-15 04:55:23

Neha
Member
Registered: 2006-10-11
Posts: 173

Re: chosen

guyssssssssssssssssssssss help
ok tell me do u have to multiply the numbers to get teh answer ? and then divide by 3? no right


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#4 2006-11-15 06:08:02

mathsyperson
Moderator
Registered: 2005-06-22
Posts: 4,900

Re: chosen

The number of ways of choosing 3 items from a group of 12 is given by 12C3, which is:

12! /[3! * (12-3)!] = 220.


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It wanted to be normal.

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#5 2006-11-15 06:13:37

Neha
Member
Registered: 2006-10-11
Posts: 173

Re: chosen

thank  u soooo much.


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