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by Owl Zero on January 9th, 2009

Owl Zero

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How many prime numbers are greater than 9 but less than 25?

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  • by Clacker on January 9th, 2009

    Clacker

    5
    A prime number is a natural number whose only proper divisor is 1
    11, 13, 17, 19 and 23

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  • by yawn on January 9th, 2009

    yawn

    Five - 11,13,17,19,23. Prime numbers have only two factors - 11x1 = 11, you can't make it any other way. Unlike 10 which has the factors 1,2,5 and 10. (1x10 =10, 5x2 = 10)

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