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28 September, 11:10

Which of the following is a prime number 67,65,63 or 60

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  1. 28 September, 13:42
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    Use the rule of divisibility:

    60 is composite because it is even so it can be divided by 2

    67 is prime because none if the divisiblility rules work on it

    65 is composite because it has a 5 by the end which means it can be divided by 5

    63 is composite because the sum of the digits equal to 9 which can be divided by 3 and 9
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