Question

100 students are boarding the Hogwarts express! they all have allocated seats but the 1st wizard to board sits in the wrong seat. each student then gets onto the train and takes their allocated seat if it’s available. if not, they pick a seat at random. what is the percent chance the last passenger will get his seat?

Answer 1

total seats allocated=100
no of students=100
∴if the students sit in any way all will get the seat
then,
the  passenger having the full chance to get the seat is the last passanger