Mathematics, 19.09.2021 14:00 smagallanes

There are 135 people in a sport centre. 77 people use the gym. 62 people use the swimming pool. 65 people use the track. 27 people use the gym and the pool. 23 people use the pool and the track. 31 people use the gym and the track. 4 people use all three facilities. Given that a randomly selected person uses at least two facilities, what is the probability they use all the facilities?

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