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The prime numbers from 1 to 20 are 2, 3, 5, 7, 11, 13, 17, and 19.

The original answer incorrectly included 1, 9, and 15.

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Q: Prime numbers from 1 to 20?

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These are the prime numbers 1-20 2,3,5,7,11,13,17,19

2/5 of the numbers from 1 to 20 are prime numbers

The prime numbers between 1 and 20 are 2, 3, 5, 7, 11, 13, 17, and 19.

There are 8 prime numbers between 1 and 20. The numbers are 2, 3, 5, 7, 11, 13, 17, and 19.

Prime numbers only have factors of 1 and themselves: 23, 29

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These are the prime numbers 1-20 2,3,5,7,11,13,17,19

2/5 of the numbers from 1 to 20 are prime numbers

Prime numbers are numbers that can only be divided by one and itself. The answer is 2,3,5,7,11,13,17,19. 1 is not prime nor composite.

The prime numbers between 1 and 20 are 2, 3, 5, 7, 11, 13, 17, and 19.

There are eight prime numbers from 1 to 20: 2 3 5 7 11 13 17 19

The prime numbers from 1 - 20 are 2, 3, 5, 7, 11, 13, 17, and 19.

There are 8 prime numbers between 1 and 20. The numbers are 2, 3, 5, 7, 11, 13, 17, and 19.

Prime numbers only have factors of 1 and themselves: 23, 29

The Prime Numbers in the 20's are 23 and 29 because they are only divisible by 1 and the number itself.

There are 8 out of 20 numbers that are prime, so 8/20, or 2/5.

It is 75.

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