After-school club
30 children in a school club need to split into two teams. They put 15 white and 15 black marbles into a basket and draw lots. The teams will be made up of children who draw marbles of the same colour. Patricia drew first and pulled out a white marble. After her, Martina draws — she does not want to be on the same team as Patricia. What is the probability that her wish will come true?
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