Question

what is the ratio of prime numbers and composite numbers from the set of natural nurnbers from
1 to 20?​

Answer 1

Answer:

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Step-by-step explanation:

1 is no prime and no compsite number. 1 is the identity element to multiplication (and division).

2, 3, 5, 7, 11, 13, 17, 19 are all the primes between 1 to 20.

4, 6, 8, 9, 10, 12, 14, 15, 16 and 18 are all the composite numbers between 1 to 20.

Answer 2

Answer:

4,6,8,10,12,14,16,18,20...