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!

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.