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For mathematics lovers

Algebra Level 2

Charles uses 489 digits to write the page numbers of a book. What is the last page number of the book?

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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View solutions

by Om Agarwal

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