Hard
Math and Logic
3R, 2B hats. 1st/2nd can't guess. What is 3rd's color?
Choose an answer
A.Blue
B.Both colors
C.Cannot determine
D.Red
Answer: Red
If the 3rd professor saw two blue hats, he would know his is red (only 2 blue exist). Since he doesn't know, the others must have at least one red hat... follow the deduction chain.