The famous Blue Diamond was stolen from a museum. A thief swapped it for a cheap green imitation diamond. The day it was stolen, 2000 people entered the diamond room one by one. Inspector Bebro must find the thief by interviewing these people. Bebro has a list of all 2000 people in the order they entered the room. The only question Bebro is allowed to ask is [i]was the diamond green or blue when you saw it?[/i] The thief will lie and say [i]green[/i] but everyone else will tell the truth.[br][br][color=#45818e]Bebro claims "I can find the thief by interviewing at most 20 people!" Is this claim true or false?[/color]