A bag contains 80 red balls numbered 1 to 80. Before the game starts you are asked

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Question:

A bag contains 80 red balls numbered 1 to 80. Before the game starts you are asked to pick 15numbers and note them down on paper. After which 25 balls are picked at random withoutreplacement.What is the probability that all your numbers are selected?What is the probability that only 4 of your numbers are selected?