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Probability Problems - Questions

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Question 1
14941

A man selected a random number from 1 to 20 inclusive. Find the probability that the number is:

a) prime
b) a multiple of 2 or 7
c) a not a factor of 15

\(a) ~ \dfrac{{2}}{{5}}~~b) ~ \dfrac{{11}}{{20}}~~c)~ \dfrac{4}{{5}}\)

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