Hi, This problem has been taken from the ' statistical analysis ' question paper for master of commerce examination of well-known university in India. "A lift starts with 5 passengers and stops at 8 floors. Find the probability that no two or more passengers leave at the same floor. Assume that all arrangements of discharging passengers have the same probability." Ans: I don't know the correct answer. I expect some hint from the members of this mathhelpforum to solve this problem.I haven't used latex here