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The factors of 115 are 1, 5, 23, 115 For them to be common, they need to be compared to another set of factors.
To find the factors of a number, you first need to split that number into its prime factors. In the case of 15, this produces: 15 = 3x5 The next step is to note that every factor of the number (apart from 1) is the product of any combination of its prime factors. Thus, the factors of 15 are: 1, 3, 5 and 15.
Aside from the obvious 39 & 1, 3 x 13 = 39.
The factors of 24 are 1,2,3,4,6,8,12 and 24. For them to be common, they need to be compared to another set of factors.
The factors of 16 are 1, 2, 4, 8 and 16. For them to be common, they need to be compared to another set of factors.