math
posted by jess .
What are the odds in favor of getting at least one head
in three successive flips of a coin?

1/2 * 1/2 * 1/2

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 
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