Chain Reaction!

Discrete Mathematics Level 2

A person in a group of \(60\) wishes out aloud "Happy New Year" to another person . This initiates a chain reaction, resulting in every person in the group wishing each other a "Happy New Year" (whether they like it or not). How many times has the phrase "Happy New Year" been spoken?

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Chain Reaction!

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100 Day Summer Challenge

Chain Reaction!

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, conceptual quizzes.

Our wiki is made for math and science

Master advanced concepts through explanations, examples, and problems from the community.

Used and loved by 4 million people

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

Master advanced concepts through explanations,
examples, and problems from the community.

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

Master advanced concepts through explanations,
examples, and problems from the community.

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