There are 130 people in a sport centre.

61 people use the gym

68 people use the swimming pool

60 people use track

25 people use the gym and pool

30 people use the pool and the track

19 people use the gym and the track

6 people use all three facilities

Given that a randomly selected person uses the gym and the track, what is the probability they do not use the swimming pool?

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step-by-step explanation:

let m = monomial

let t = trinomial

so, m times t = t.

monomial times a trinomial = another trinomial.