math
posted by jane .
Decide if it's permuatation or combination .
1how many teams of 4 horses be made if there were 9 horses in total ?
2mike has nice baseball trophies to arrange on the shelf . How many different ways can be arranged ?
3in 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 
Steve
if order matters, it's permutations
if not, then it's combinations
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