I got Primes.

Number Theory Level 1

How many prime numbers are there up to 20?

8 10 9 7

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Lew Sterling Jr by Lew Sterling Jr , 24, USA

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3 solutions

Syed Hamza Khalid
Oct 19, 2017

2 , 3 , 5 , 7 , 11 , 13 , 17 , 19 → 8 \large {2,3,5,7,11,13,17,19 } \to 8

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Sahil Jindal
Nov 15, 2014

simply count the number of prime nos. upto 20

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Lew Sterling Jr
Nov 15, 2014

Prime Numbers up to 20: 2, 3, 5, 7, 11, 13, 17, and 19

Total: 8 Prime Numbers

Note: To the ones who chose "9" as their answer, you must of thought about "1" as a "prime number". If you want info as to why "1" is not a prime, then check here Prime Numbers and The number 1 not prime because... .

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