This is what happens in Gifted and Talented when we get asked MindTraps

Teacher: Jim walks home with $300, and a person walks up and tells him that he could double his money if he rolls a 5 or 6 on one die, a 4, 5, or 6 on one of two dice, or a 6 on one of three dice. Which one should he choose?
Person: The first one!
Other Person: The third one!
Me: Well I'd walk away from the strange man who wants me to gamble my $300.
Teacher: That's the answer!
Me: Wait, what?