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All Primes Are Odd

Number Theory Level 1

True or False:

\(\quad\) Since every even number is a multiple of 2, hence no even number is a prime.

True False

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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 7 million people

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including olympiad champions, researchers, and professionals.

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by Calvin Lin

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