Prime Numbers: An Easy Puzzle

Number Theory Level 2

How many prime numbers are there that are less than 10?


The answer is 4.

Freddie Zhang by Freddie Zhang , 15, Canada

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1 solution

Freddie Zhang
Dec 15, 2018

It is 4 since 9 is not one and 2 is.

This is the standard solution

0 Helpful 0 Interesting 0 Brilliant 0 Confused

I think the phrase in 10 can be misunderstood. I would advise you to write less than 10 .

Henry U - 2 years, 5 months ago

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Thanks. I've updated the problem statement to reflect this.

Brilliant Mathematics Staff - 2 years, 5 months ago

Thank you! I have updated the problem.

Freddie Zhang - 2 years, 5 months ago

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