Write all the natural numbers from 1 to 20.What fraction of them are prime numbers
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The natural number from 2 to 20 are 2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20. there are 19 natural numbers. Prime numbers are 2,3,5,7,11,13,17,19. there are 8 prime numbers .
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natural numbers: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
n=20
prime numbers = 2 3 5 7 11 13 17 19
n1= 8
therefore the fraction of prime numbers = n1/n =8/20=2/5
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