Question

When tossing 2 coins, P(at least 1 tail) = 1 - P(not all tails).

Answer 1

Is this a true or false? What's the question?

Answer 2

yeah its true or false

Answer 3

Do you have a guess before I explain it?

Answer 4

false

Answer 5

That's correct. I like to think about it rather explicitly. P(not all tails)=P(0 tails or 1 tail). Thus, 1-P(0 tails or 1 tail)=P(2 tails) since you're tossing two coins. This is obviously not the same as P(1 tail).

Answer 6

Thank you :)

Answer 7

You're welcome.