The prime numbers are: 2 3 5 7 11 and 13 so therefore as a fraction of 15 it is 6/15 or 2/5 simplified
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2/5 are prime, 8/15 are composite (and 1/15 is neither).
2/5 of the numbers from 1 to 20 are prime numbers
There are 15 prime numbers between 1 and 49
Prime numbers from 1 to 15 are 2, 3, 5, 7, 11 and 13.
There are 15 prime numbers in between 1 and 52. 2,3,5,7,11,13,17,19,23,29,31,37,41,43,47