Question
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.
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.