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Birthday problem for a friend

Calculus Level 1

\[ \int _{ 10 }^{ 210 }{ \frac { 1 }{ x } } dx\quad =\quad ?\]

Enter your answer to 3 decimal places.

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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 5 million people

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including olympiad champions, researchers, and professionals.

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by Mehul Arora

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