1+17, 2+16, 3+15.........................on and on until 9+9 that is incorrect those are three number methods the two numbers are9+9!!!!!!!!!!!!!!!!!!!!
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Each of these numbers will go evenly into 18: 1, 2, 3, 6, 9, 18.
The numbers that divide evenly into 18 are 1, 2, 3, 6, 9, 18, and the negative of each of those.
none evenly because it is a prime number.
no numbers!
It does not.