Combinatorics
Permutations
Easy
No Correct Letter
Four letters are randomly placed into four addressed envelopes, one letter per envelope. What is the probability that no letter reaches the correct recipient?
Quant interview-style problem · QS-P009
Question 1 of 25
Practicing conceptDerangements· 25 questions
← Back to lessonThink first. Use hints deliberately. Study the reasoning only when you need it.