Multiply the values together: 4*2*3 = 8*3 = 24 which is the answer
There are 24 different outfits possible, which means he can wear a different outfit for 24 days in a row (afterwards he'd have to reuse an outfit combo). Think of it as a decision tree. At the top row, you'll have 4 paths. Each path representing a different shirt. Then under that for the next row you'll have 2 paths per branch in the upper row (total of 2*4 = 8 paths so far). This second row represents the ties. Finally the third row will have 3 branches per node in the row above it, so a total of 3*8 = 24 paths are possible.
Check out the attached image for the tree.
Answer: 24
