The amount of different ways possible can be shown by 7!=5040 Im pretty sure.
Answer:
I tried but I couldn't figure it out sorry
5•1=5
5•2=10
5•3=15
5•4= 20
5•5=25
5•6=30
There are multiple more, just keep multiplying by a number higher than 4
You’ll be able to take out $3 for 21 days
