Question

Five persons entered the lift cabin on the ground floor of an eight-floor apartment. Suppose that each of them independently and with equal probability, can leave the cabin at any floor beginning with the first floor, then the probability of all five persons leaving at different floors is:

• A. \( \frac{7}{8^5} \)
• B. \( \frac{1}{8^5} \)
• C. \( \frac{5}{8^5} \)
• D. \( \frac{7}{5^3} \)

Hint:

For probability problems, use favorable outcomes divided by total possible outcomes.

Answer 1

The Correct Option is B