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Every Number Serves A Purpose

Number Theory Level 1

15 is not divisible by 6.
But for an integer $A$ , the product $15\times A$ is divisible by 6.

Is it true that $A$ must be divisible by 6?

Yes, it is true No, it is not true

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Excel in math and science

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It's hard to learn from lectures and videos

Learn more effectively through short, interactive explorations.

Used and loved by over 7 million people

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including olympiad champions, researchers, and professionals.

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by Ronald Chén

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