We can do canonical distribution of 75 to see it.
75|3
25|5
5|5
1
So, factors of 75 are 3, 5, 5.
It means that if we multiply 3 *5*5 we will get 75. But we can mulply only 2 (3 and 5 for example) and then mulitply by the third factor, so we have few posibility
3*5*5=75
15*5=75
3*25=75