Question

True or false
When tossing 2 coins p(at least 1 head) = p(not all tails)

Answer 1

Please help!

Answer 2

When you toss two coins, these are the possible outcomes:
TT
TH
HT
HH

P(at least 1 heads):
TT
TH <---
HT <---
HH <---
So P(at least 1 heads) = 3/4

P(not all tails)
TT
TH <---
HT <---
HH <---
P(not all tails) = 3/4

This is an obvious result since "not all tails" means the same as "at least one heads".

Answer 3

So is it false?

Answer 4

From my response above, didn't you notice that
1. both probabilities are 3/4?
2. "at least 1 heads" means the same as "not all tails"?

Answer 5

Oh okay. Sorry