pat listed numbers that all have 15 as a multiple.which of the following could be Pat's list?1,3 5,15 or 1,5,10,15or1,15,30,45 or 15,115,215

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Niyex
15,30,45. all have 15 as part of their multiple
15, 30, and 45 because 15x2=30 and 15x3=45. If you keep repeating this pattern, you will uncover more numbers! :)