Paul Stone wrote: "If he COULD know what colour his hat is, and evidently, since the riddle was posed, he can, then, since there is definitely no way of knowing he's wearing a red had, it MUST be white." If P2 knew that he was wearing a white hat, then P3 would know that he is wearing a red hat. Sincerely, Phil Enns Toronto, ON ------------------------------------------------------------------ To change your Lit-Ideas settings (subscribe/unsub, vacation on/off, digest on/off), visit www.andreas.com/faq-lit-ideas.html