Excel in math, science, and engineering

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Birthday Magic Card

Number Theory Level pending

My day of birth appears in exactly the following color cards:
red, yellow, green and purple.
What is my day of birth?

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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View solutions

by Venkatachalam J

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