Question

Three fair coins are tossed. What is the probability that at least one is a tail? (Enter the probability as a fraction.)

Answer 1

1/2

Answer 2

1 - P(no tail)

no tail means HHH. there are total possible outcome.

so 1 - 1/8 = 7/8 <--

Answer 3

@precious32

Answer 4

i'm here

Answer 5

No it is 3/6 so it would be 1/2...

Answer 6

Hold up... Once I wrote it out on paper this is what I got...

Question asks for at least 1 head which is any of the top 7 outcomes.

Now each of these outcomes has a probability of (1/2)*(1/2)*(1/2) --> 1/8 since we have 3 coins flipped at a time.

So the answer is 7/8. In other words, it is highly likely to get at least one head when flipping 3 coins. The only time you would not is by getting 3 tails.

Sorry for the confusion.... @precious32

Answer 7

it's ok I worked it out 3 times and was coming up with 1/2 then I went back and did it again and also got 7/8. Thank both of you