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Pandora's box

Number Theory Level 2

Find the smallest whole number that, when divided by 5, 7, 9, and 11, gives remainders of 1, 2, 3, and 4, respectively.

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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 Sarthak Gupta

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