Question

Julia has 2 chemistry books and 3 math books. In her rush to get to class, she grabs

one book, then a second book, without stopping to look. What is the probability that
she pulls a math book out first and a chemistry book out second?

Answer 1

There is a 3/10, or 30% chance that she pulls a math book out first and a chemistry book out second.

(2 + 3) = 5 books total. This means 2/5 are chemistry and 3/5 are math. If she pulls one book out, then another… it means she’ll have one less book to grab from.
This is represented by:
(3/5)x(2/4)= 3/10