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Prime numbers
(click a problem to attempt)
Which one of the following numbers 4, 5 and 6 is a prime number?
Which one of the following numbers 13, 14 and 15 is a prime number?
Which one of the following numbers 15, 16, 17 and 18 is a prime number?
Which one of the following numbers 9, 11 and 13 is not a prime number?
Which one of the following numbers 13, 15, 17 and 19 is not a prime number?
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