One large hat? (Similar ToM)
Six gentlemen hung their hats in the cloakroom at their club. After imbibing for several hours, when it came time to leave, each had blurred vision, and in consequence, five of them select one of the hats and leave, but one guy has a large head and if his hat is still there, he will find his hat. But his time to select his hat could be from first to last. If his hat is not there, he still takes one.
What is the probability of no one getting the right hat?