Hats Party

Discrete Mathematics Level 1

15 people attended a party. 11 people were wearing black hats and 4 people were wearing white hats. If all the people in white hats shook all the people in black hats hands, how many hand shakes would there be?

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100 Day Summer Challenge

Hats Party

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Courses

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Community

100 Day Summer Challenge

Hats Party

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.