Subject Computer Science Discrete Math

Question

In a raffle there are 100 tickets. 10 of the tickets have prizes. The tickets are mixed in a bowl and then two tickets are drawn, one after the other. What is the probability that just one of the tickets has a prize?

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Since only one ticket out of the two must have a prize, we identify two scenarios:
1st ticket has a prize and the 2nd not
1st ticket does not have a prize and the 2nd ticket has a prize.

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