Finite Math, Probability

Question

There are 90 students in a class of whom 63 are taking Math and 58 are taking English, 45 of whom are taking both classes. Find the probability that a student is taking Math, given they are taking English.

Answer 1

We know they take English so we have 58 to choose from.

Of these 45 take Math.

So probability = 45 / 58