Infinitely many.
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There are only two numbers that can be multiplied to make 15. These numbers are 3 and 5. This is true because 3*5 = 15
3 pairs 1 times 12, 2 times 6, and 3 times 4
there are 899 whole numbers that have three digits.
Impossible if you are talking whole numbers. Else, you can do 1.9 times 5 times 2. That is kinda cheap, but it is an answer.
A factorial is a whole number multiplied by all the whole numbers less than that number. So 3 factorial (written as 3!) is 3 times 2 times 1=6