Students experience and master probability concepts with a lively game that features bouncing gumballs in a machine.  Given randomly chosen combinations of different color or numeric value balls, students are asked such questions as: What's the chance of getting a green ball; or getting a green and a red ball; or not getting a blue ball.

Choice of three difficulty levels to build student progress.

Easy level: Given 1 blue, 3 red, 4 green

What's the Chance of getting:

One blue ball?
One blue OR one red?
NOT one green?

Medium level: Given 2 blue, 1 red, 3 green

What's the Chance of getting:

a blue, replace it, and get a green?
one green, replace it, get a red, replace it, and get a blue?

Hard level:  Each color ball is assigned a value 1, 2, or 3.

What's the Chance of getting:

one ball, replace it, then get another whose total equals 4?
one ball, replace it, and get another, replace it and then get a third whose total equals 6?