Question

List the numbers from 1 to 20 and find the ratio of the number of prime numbers to the numbers of composite numbers.​

Answer 1

Prime no's = 2 , 3 , 5 , 7 , 11 , 13 , 17 , 19

Composite no's = 4 , 6 , 8 , 9 , 10 , 12 , 14 , 15 , 16 , 18 , 20

The ratio should be ;

Prime : Composite

= 8 : 11

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Answer 2

To find:

List the numbers from 1 to 20

Find the ratio of the number of prime numbers to the number of composite numbers

Step-by-step explanation:

The numbers from 1 to 20 are 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20.

1. Of these, the prime numbers are 2, 3, 5, 7, 11, 13, 17 and 19. So there are 8 prime numbers.
2. And the composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18 and 20. So there are 11 composite numbers.

Then the ratio of the number of prime numbers to the number of composite numbers is 8 : 11.

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