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Number Theory Level 4

How many non-zero 5-digit binary strings, when held up to a mirror, are equal to twice the value of the binary number you see?

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

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including olympiad champions, researchers, and professionals.

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by Fin Moorhouse

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