# Coin Toss Problem

1. May 9, 2006

### Jfontenot06

If you have five coins and you flip them what is the probability that at least one coin falls heads?

2. May 9, 2006

### siddharth

Well, what are your thoughts about the problem? Do you have any idea on how you can solve this? You need to show your work before you get help.

3. May 9, 2006

### mathman

Hint: prob at least 1 head = 1 - prob no heads. Try working from there.

4. May 9, 2006

### Jfontenot06

Well what I was thinking is that the chances of a coin landing on heads is 1/2. Since there are five coins it should be (1/2)^5 = 1/32

5. May 9, 2006

### mattmns

That would be the probability of all 5 coins landing on heads.

Look back at mathman's hint again, that is where you want to go with the problem.

6. May 10, 2006

### DaveC426913

Same hint, different angle:

What are the chances of throwing a set and having NONE turn up heads?

7. May 19, 2006

For one coin: 3 tosses

2 x 2 x 2

1st toss = happens 2 ways
2nd toss = happens 2 ways
3rd toss = happens 2 ways

s = { HHH, HHT, HTH, THH, HTT, THT, TTH, TTT}

Feel free to correct this. Cheers