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I have 200 tickets, and I'll sort 20 awards, 1st,2nd,3rd...20th.

I ask you to help me creating a probably calculator who should say:

Probability of winning 1st award Probability of winning one of the first tree awards (1st,2nd or 3rd) Probability of winning one of the awards. 
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    Hm .. $\frac 1{200}$, $\frac 3{200}$, $\frac 1{10}$?2012-09-08
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    That's not as simple as this.. Following your reasoning, if I bought 100 tickets, I would have this probabilities of winning: 100/200, 300/200, 100/102012-09-08
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    And I need a formula.. Please help me.2012-09-08
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    You didn't write in your question about bying more than one ticket. I'll write an answer.2012-09-08

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