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https://math.answers.com/basic-math/How_many_co-primes_less_than_21_are_co-prime_with_21

How many co-primes less than 21 are co-prime with 21? - Answers

1, 2, 4, 5, 8, 10, 11, 13, 16, 17, 19 and 20. The distinct prime factors of 21 are 3 and 7, so I removed multiples of them.

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How many co-primes less than 21 are co-prime with 21? - Answers

https://math.answers.com/basic-math/How_many_co-primes_less_than_21_are_co-prime_with_21

1, 2, 4, 5, 8, 10, 11, 13, 16, 17, 19 and 20. The distinct prime factors of 21 are 3 and 7, so I removed multiples of them.

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https://math.answers.com/basic-math/How_many_co-primes_less_than_21_are_co-prime_with_21

How many co-primes less than 21 are co-prime with 21? - Answers

1, 2, 4, 5, 8, 10, 11, 13, 16, 17, 19 and 20. The distinct prime factors of 21 are 3 and 7, so I removed multiples of them.

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  1, 2, 4, 5, 8, 10, 11, 13, 16, 17, 19 and 20. The distinct prime factors of 21 are 3 and 7, so I removed multiples of them.
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