Question

A bag contains 10 marbles: 2 are green, 4 are red, and 4 are blue. Carlos chooses a marble at random, and without putting it back, chooses another one at random. What is the probability that the first marble was blue and the second is green? Write answer as a fraction in simplest form.

Answer 1

The probability is 4/45

Explanation:

We know the chances of a blue marble is 4/10 so thats a first

The chances of a green marble WITHOUT the blue marble being put back is 2/9

So you multiply the two fractions

2/9*4/10

you’ll get 8/90 or simplified

4/45

Answer 2

Explanation:

The fraction is 4/10 * 2/9 = 4/45.