# Thread: coins

1. ## coins

I need help with this question:
A fair coin is tossed four times. Compute the probability that the outcome is at least three tails.

2. Think you posted in the wrong subforum, not really a university question?

What have you tried so far?

Some hints:
1. What is the chance on this sequence: tail-tail-tail-head?
2. Differs the answer from the previous question from: tail-head-tail-tail?