Question

A bag contains 10 marbles: 2 are green, 4 are red, and 4 are blue. Tammy chooses a marble at random, and without putting it back, chooses another one at random. What is the probability that both marbles she chooses are blue?

Answer 1

There are 10 marbles, out of these 10 there are 4.

The probability of her picking a blue marble is 4/10

This can be simplified to 2/5