KöMaL 2021 B5172
Six regular dice are placed in a cup, and rolled simultaneously. Those dice that do not show a 6 are returned to the cup, and rolled again. If there are dice that still not show a 6, those dice are rolled a third time. The procedure is repeated until every dice shows a 6. What is the probability that exactly six rolls are needed?
Official text KöMaL. Quoted with source.
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