Posted by **jane** on Tuesday, September 18, 2012 at 11:17am.

Decide if it's permuatation or combination .

1-how many teams of 4 horses be made if there were 9 horses in total ?

2-mike has nice baseball trophies to arrange on the shelf . How many different ways can be arranged ?

3-in a math class , there are 24 students,the teacher picks 4 students to help do a demonstration.how many diffrent groups of 4 could she have chosen ?

- math -
**Reiny**, Tuesday, September 18, 2012 at 11:55am
1. We can't tell from the question. If the position of a particular horse in the team is important, then it is a permutation. If you just care about groups of 4 horses, then you have a combination. I think the placement of a horse should be important

2. combination

3. combination, unless members of the group have specific tasks in the demonstration.

1. Permutation: 9x8x7x6 = P(9,4) = 3024

combination : C(9,4) = 126

2. 9!

3. C(24,4) = 10626

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