Plane Passengers
One hundred people standing in a line to get on a plane. The first passenger in the head of the line lost his ticket (which indicates his seat in the plane). As a result, the first passenger sits on a random seat. Every consequent passenger sits on his seat(according to his ticket) in case its available, otherwise, he sits in a random seat.
What is the probabilty that passenger 100# finds his place already taken when he gets on the plane?
Thanks
