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# Can someone give me a formula or a quick way of finding

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VP
Joined: 10 Jun 2007
Posts: 1465
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Kudos [?]: 133 [0], given: 0

Can someone give me a formula or a quick way of finding [#permalink]  21 Jun 2007, 23:02
Can someone give me a formula or a quick way of finding this:

If you toss a coin five times, how many possible combinations for getting tail exactly three times?

I don't know how to find this with out doing it manually...help plz.
Director
Joined: 15 Jun 2007
Posts: 505
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Kudos [?]: 9 [0], given: 0

n!/(k!(n-k)!) I think
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