Math

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In a group of 40 students, 22 study Economics, 25 study Law, and 3 study neither of these subjects. Determine the probability that a randomly chosen student studies:

1. Both Economics and Law
2. At Least one of these subjects
3. Economics given that he or she studies Law


I really don't understand how to calculuate the 3rd one.

  • Math -

    Isn't it the same answer as number 1?

  • Math -

    That is what I am not sure about. Can someone please help me?

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