SOLUTION: inhow many ways can a pair of co-captions be chosen from 10 tennis players?

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Question 304199: inhow many ways can a pair of co-captions be chosen from 10 tennis players?
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
in how many ways can a pair of co-captions be chosen from 10 tennis players?
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# of pairs = 10C2 = 45
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Cheers,
Stan H.