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Posted by **gary** on Sunday, January 15, 2012 at 11:31am.

What is the probability that all 3 pennies will land on tails?

- math -
**Reiny**, Sunday, January 15, 2012 at 11:38amHHH

HHT

HTH

HTT

THH

TTH

THT

TTT

So, what do you think?

- math -
**drwls**, Sunday, January 15, 2012 at 11:38amThere are 2^3 = 8 possibilities (permutations) if the order of appearance is important.

HHH

HHT

HTH

HTT

TTT

THT

TTH

TTT

There are 4 combinations (0,1,2 or 3 tails)

The probability of TTT is 1/8

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