If there are 3 mystery and 4 romance books left, what is the probability that the first friend will randomly select a mystery book and the second friend will ra

Question

If there are 3 mystery and 4 romance books left, what is the probability that the first friend will randomly select a mystery book and the second friend will randomly select a romance book?

Answer 1

The total number of books is 7.

The probability of picking a mystery is 3/7.   After the mystery is pick only 6 books remain.

The probability of picking a romance is 4/6, 2/3.

 

The probability of both happening is 3/7(2/3) or 6/21.