Because 1, 3, 5 and 15 are the only positive whole numbers that will divide evenly into 15 with no remainder.
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The factors of 11 are 1 and 11 The factors of 15 are 1,3,5, and 15. 1 is the only common factor of 11 and 15.
The factors of 15 are 1,3,5, and 15The factors of 5 are 1 and 5.there are only two common factors of 5 and 15 and they are 1 and 5.
The common factors of 12 and 15 are 1 and 3.
Oh, dude, a composite number is basically a number that has more factors than just 1 and itself. So, for 15, you've got 1, 3, 5, and 15 as factors, making it a composite number. It's like the popular kid at the math party with all those factors hanging out with it.
The factors of 15 are 1, 3, 5, 15 The factors of 37 are 1, 37