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A number theory problem by Luke Tan

Number Theory Level 3

Is the number 1000C500 (1000 choose 500) divisible by 7?

Yes There's no way to tell I dunno No

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.

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