Question

if you toss 7 Fair coins in how many ways can you obtain at least one tail

Answer 1

Every coin has two faces ( Head and Tail)

So, if you toss 1 money there are two posible results H o T

If you toss 2 coins there are 4 possible results: HH, TT, HT, TH

For 7 coins: you have 128 posible results: