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Think a bit

Level pending

A number is greater than 3 but less than 8. Also the number is greater than 6 but less than 10. What is the number?

6 7 8 5

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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

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

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by Aishee Ghatak

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