SOLUTION: Hello, Can you please show me how to do this problem? A baseball manager has 12 players of the same ability. How many 9 player starting lineups can he create? Thank You!

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Question 524152: Hello,
Can you please show me how to do this problem?
A baseball manager has 12 players of the same ability. How many 9 player starting lineups can he create?
Thank You!
Found 2 solutions by stanbon, oberobic:
Answer by stanbon(75887) (Show Source):
You can put this solution on YOUR website!
A baseball manager has 12 players of the same ability. How many 9 player starting lineups can he create?
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# of groups of 9 = 12C9 = (12*11*10)/(1*2*3) = 220 lineups
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Cheers,
Stan H.
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Answer by oberobic(2304) (Show Source):
You can put this solution on YOUR website!
With 12 players, how many ways can the manager pick a line-up of 9 players.
n = 12
k = 9
.
n!/(n-k)! = 12!/3! = 79833600
.