Question

When tossing two coins,P(at least 1 Head)=1-P(not all tails)
True or False?

Answer 1

True?

Answer 2

I think it's not true, that is false
P(at least 1 head) = 1 - P(all tails).
Since other then all tails, all other outcomes satisfy the condition. So, you'll get the above expression