Who wants some glass marbles?

Discrete Mathematics Level 1

You roll 2 fair, six-sided dice, and will be given as many marbles as the sum of the two numbers you roll. What is the expected value of the number of marbles you get?

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Who wants some glass marbles?

Excel in math and science

Master concepts by solving fun, challenging problems.

It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 6 million people

Learn from a vibrant community of students and enthusiasts, including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.