KöMaL 2010 C1031
In the lottery, five out of the numbers 1 to 90 are drawn. Ticket holders mark five numbers on each ticket. A man bought two tickets and marked ten different numbers on them altogether. Given that four out of his ten numbers were drawn, what is the probability that he had a ticket with ) four numbers drawn? ) two numbers drawn?
Official text KöMaL. Quoted with source.
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