SOLUTION: Leslie has 7 books. There is enough space on a shelf for 3 books. In how many ways can 3 of the 7 books be arranged on the shelf? Out of the 12 girls who tried out for the softb

Question 1118314: Leslie has 7 books. There is enough space on a shelf for 3 books. In how many ways can 3 of the 7 books be arranged on the shelf?
Out of the 12 girls who tried out for the softball team, 10 will be chosen for the team. Find the number of different 10-person teams.
Answer by rothauserc(4718) (Show Source): You can put this solution on YOUR website!
use the combination formula nCk, n items take k at a time
:
(1) 7C3 = 7! / (3! * (7-3)!) = 35 ways
:
(2) 12C10 = 12! / (10! * (12-10)!) = 66 ways
:

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