4. Find the ratio of prime numbers to composite numbers from 1 to 20.
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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.
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Step-by-step explanation:
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.
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