The only numbers that multiply to get a product of 39 are 1 and 39, or 3 and 13.
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13 x 3
13 and 3. Isnt it?
3*13 is the prime factorization of 39. If you use non-integers, there are infinite many pairs (or groups) of numbers that multiplied makes 39.
There are twenty numbers between 19 through 39, including 19 and 39. So the problem is 20 times 20 times 20 times 20 times 20. 320,0000
24+15=39