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719 Cases To Go

Number Theory Level 2

Is it possible to rearrange the digits of the number 123456 to form a perfect square?

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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, interactive explorations.

Used and loved by over 6 million people

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including olympiad champions, researchers, and professionals.

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by Pi Han Goh

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