Question

For tennis practice, a coach pools a large number of balls in a big bin for a champion he is tralning. Commercially available bins have a capacity for
100 balls. On a particular day, there are 91 balls in the bin. Of these balls 40 are new, and the rest are used. The coach thinks that the champion's
performance is very slightly improved when he plays with brand new balls. The coach chooses six balls at random from the bin for the first set. After
the set, the balls are set aside, and six other balls are taken from the bin at random for the second set.
What is the probability that the balls used in the second set are all new?​

Answer 1

Answer:

first plus then minus then divide answer will come.

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