There are 5 red, 6 blue, 7 green, and 3 yellow marbles in a bag. What is the probability of pulling a green or yellow marble out?

Answer 1

5 Red, 6 Blue, 7 Green, and 3 Yellow marbles total.

First, let's add these all up. 5+6+7+3 = 21; 21 total marbles from which to choose. So now we have to figure out how many possible options there are for pulling a Green marble OR a Yellow marble. Note that the "OR" means we'll have to ADD the two possibilities together.

How many total Green marbles are there? 7 How many Yellow marbles? 3 7+3 = 10; 10 possible options for pulling a Green OR Yellow marble.

This means there are 10 possible options out of a total of 21 possibilities; 10/21

Answer 2

5r, 6b, 7g, 3y

P(g or y) = (7+3)/(7+3+5+6) = 10/21