Answer:
If they can make it from 3 materials and 2 fasteners, you can turn it into some kind of chart
cotton-button; cotton-snaps
satin-button; satin-snaps
silk-button; silk snaps.
Using that, which uses the 2 kinds of fasteners and each material, you can conclude that it is----
6 combinations :)
Step-by-step explanation:
hope this helps, if im wrong critique me.