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# S1 combinations/probability watch

1. "to win, a contestant must correctly select four numbers from the numbers 1-15 inclusive. What is the probability that John wins if he buys 1 ticket?'

I think the answer will be something over 15choose4 (which is 150150)
2. You're almost there - there's 15 choose 4 possible combinations but only 1 of them is a winner. So the probability of winning is 1 over (15 choose 4)
3. (Original post by ttoby)
You're almost there - there's 15 choose 4 possible combinations but only 1 of them is a winner. So the probability of winning is 1 over (15 choose 4)
makes sense, thanks.

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Updated: November 30, 2011
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