KöMaL 2016 C1332
Vicky's grandma buys one lottery ticket per week. What is the probability that she will not win at all during the course of a whole year (in 52 weekly draws)? (In the lottery, 5 numbers are drawn out of 90. A ticket will win if at least 2 are marked out of the five numbers drawn.)
Official text KöMaL. Quoted with source.
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