Using the factors of 18, it is found that he can hang the pictures in the wall in the following ways:
The factors of 18 are the numbers by which 18 is divisible by, which are: {1, 2, 3, 6, 9, 18}, since:
[tex]\frac{18}{1} = 18, \frac{18}{2} = 9, \frac{18}{3} = 6, \frac{18}{6} = 3, \frac{18}{9} = 2, \frac{18}{18}[/tex]
Considering the factors, the ways to organize the pictures are:
To learn more about factors, you can take a look at https://brainly.com/question/10269328