Question

what is the set of all factors of 15 in roster form​

Answer 1

$\huge\sf\underline{\pink{A}\orange{N}\blue{S}\red{W}\green{E}\purple{R}}$

The set of all the whole number factors (natural number factors) of 15 is {1, 3, 5, 15}. The set of all the whole number divisors (natural number factors) of 15 is {1, 3, 5, 15}. The set of all the natural number multiples of 15 is {15, 30, 45, 60, …, 15n, …}.