Of the students attending a lecture , 50% could not see what was written on the board and 40% could - Maths - Probability

Question

Of the students attending a lecture , 50% could not see what was
written on the board and 40% could not hear what the lecturer was
saying most unfortunate 30% fell into both of these categories what
is the probability that a student picked at random was able to see
and hear satisfactorily?

Aman · Accepted Answer

Of the students attending a lecture , 50% could not see what was written on the board and 40% could not hear what the lecturer was saying. most unfortunate...30% fell into both of these categories. what is the probability that a student picked at random was able to see and hear satisfactorily?