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the 10 bird question

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The hunter saw 10 birds in the branch and shot one of them. How many birds are still in the branch?

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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

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

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by Mika Servillon

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