Three possible combinations: 17+1, 13+5 and 7+11.
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The only two prime factors of 18 are: 2, 3
As a product of its prime factors 2*3*3 = 18.
A prime number has only 2 factors which are 1 and itself. 11 and 7 equal 18 when added.
The prime factors of 18 are 2, 3, and 3. When multiplied together, 2 x 3 x 3 equals 18. These are the three prime numbers that multiply to give 18.
2+5+11= 18.