Posted by **victoria** on Monday, February 20, 2012 at 2:44pm.

Assume that the coin is flipped 10 times.

What is the probability that both heads and tails occur?

- math -
**Jake**, Monday, February 20, 2012 at 4:25pm
If you flip 2 coins then 25% chance

- math -
**Steve**, Monday, February 20, 2012 at 6:47pm
P(no heads) = 1/2^10 = 1/1024

P(no tails) = 1/1024

P(no heads|no tails) = 1/1024+1/1024 = 1/512

so, 1-1/512 = 511/512

another way to think of it is that the 1st toss must be identical to the next 9 tosses, so 1/2^9 is the P(next 9 the same)

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