# [SOLVED] coin tosses

• Nov 4th 2008, 01:51 PM
[SOLVED] coin tosses
question:

We toss a coin 5 times in a row. Find the probability that the number of tales is at least 1.

I believe the answer is 4/5 can someone confirm or deny this please.
• Nov 4th 2008, 01:57 PM
Plato
Quote:

We toss a coin 5 times in a row. Find the probability that the number of tales is at least 1.
I believe the answer is 4/5 can someone confirm or deny this please.

Well it is actually $\frac{6}{32}$. Can you see why?

There are $2^5=32$ possible outcomes here. Why?
So where does the 6 come from?
• Nov 4th 2008, 02:03 PM
I understand the 32 but it seems like it would be 5 choose 1 over 32 or 5/32.

would you explain the 6 please.
• Nov 4th 2008, 02:18 PM
Plato
Quote:

I understand the 32 but it seems like it would be 5 choose 1 over 32 or 5/32. would you explain the 6 please.

So the answer to at one is $\frac{31}{32}$.