Question

If you were to toss three coins, what are the odds against them all landing heads up?

Answer 1

`1/8`

Explanation:

A coin can land heads or tails.
Each outcome has a probability of `1/2`, regardless of what has happened in previous throws.
You can't "use up" the heads.

`P(HHH) = 1/2xx1/2xx1/2 =1/8`