What are the odds in favor of getting at least one head

Question

in three successive flips of a coin?

Answer 1

1/2 * 1/2 * 1/2

Answer 2

ooops, I misread. One head in three tries, so there are three ways
HTT
THT
TTH

So it is 3*1/2*1/2*1/2

Answer 3

The prob of at least one head with 3 coins
= 1 - 1/8
= 7/8
(I excluded the case of all tails)

so the odds in favour of at least one head
= (7/8):(1/8)
= 7:1