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

Author Message
VP
Joined: 10 Jun 2007
Posts: 1443
Followers: 7

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

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22 Jun 2007, 00:02
This topic is locked. If you want to discuss this question please re-post it in the respective forum.

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: 504
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22 Jun 2007, 00:08
n!/(k!(n-k)!) I think
22 Jun 2007, 00:08
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