Write the natural numbers from 2 to 20. What fraction of them is odd numbers?
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Natural numbers from 2 to 12: 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12
Prime numbers from 2 to 12: 2, 3, 5, 7, 11
Hence, fraction of prime numbers = 5/11
Thus, the natural numbers from 2 to 12 are 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 and 5/11 of the numbers are prime.
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