How does Robbie know every time?

Question

Alex and Robbie are playing a game inside of an audience. Robbie is pretending to be a mind reader. Alex asks a member of the audience to pick something in the room for Robbie to guess while Robbie steps out of the room. The person says a ruler and Robbie comes back in into the room. Alex asks, "Is it the piece of paper?" Robbie says, "No." She asks, "Is it the sun?" He says, "No." She asks, "Is it the chalkboard?" He says, "No." She asks, "Is it the ruler?" He says, "Yes."

They play again. This time, the audience member chooses the baseball cap, so Alex asks, "Is it that boy's pair of jeans?" Robbie says, "Nope." She asks, "Is it the wooden floor?" He says, "No." She asks, "Is it that girl's blonde hair?" He says, "Nope." She says, "Is it the whiteboard?" He says, "No." She asks, "Is it the night sky?" He says, "Nope." She asks, "Is it the baseball cap?" He says, "Yes."

They play once more. This time, the audience member chooses the basketball. Robbie comes back. She asks, "Is it the boy's glasses?" He says, "No." She asks, "Is it that man's tuxedo?" He says "No." She asks, "Is it the basketball?" He says, "Yes."

How does Robbie know every time?

Answer 1

Alex always asks the question about black object before the question about the chosen object.