Question

There are 5 keys. Each one will open one of five cars. If i pick one of the keys at random and try to open one of the cars what is the probability that its the right key?

Answer 1

1/5 ?

Answer 2

right - you guys are pretty good - most people say its 1/25

Answer 3

- it doesn't matter which key you pick

Answer 4

\[\langle x\rangle=\frac{1/5}{1}=\frac 15\]