Question

To open a lock, a key is taken out from a collection of
n keys at random. If the lock is not opened with this
key, it is put back into the collection and another key
is tried. The process is repeated again and again. If it is
given that with only one key in the collection, the lock
can be opened, then the probability that the lock will
open in n trials, is
​

Answer 1

Answer:

1/2 chance that it will be the right key