Secret Santa

Discrete Mathematics Level 2

Six friends are doing a "secret santa gift exchange". Their names are placed into a hat, and each person chooses a name randomly (without replacement) from the hat.

However, this leads to the possibility that someone chooses their own name and doesn’t get a gift! What is the expected value for the number of people who will choose their own name?

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Secret Santa

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Featured

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Community

100 Day Summer Challenge

Secret Santa

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.