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22 March, 09:29

I am thinking of a number it's less than 20 it's an odd number it's got 2 different prime factors what number am I thinking of

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  1. 22 March, 11:32
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    This is a real tricky question. There are a lot of primes that fit this description.

    3 5 7 9 (does't work. It's prime factors are the same).

    11 13 17 19

    I think the answer you want is 15, but it depends on what you have been told about 1. Is 1 prime or not?
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