If you flip a coin three times, what is the probability of getting tails three times?
To calculate the probability you have to name all possible results first. If you mark a result of a single coin flip as
Each triplet contains results on
Now we have to define event
The only elementary event which satisfies this condition is
Now according to the (classic) definition of probability we can write, that:
So finally we can write the answer:
Probability of getting 3 tails in 3 coin flips is