I have a secret rule for sets of three numbers. The set 2, 4, 6 fits it. Your job is to find the rule. Make a guess, then test any three numbers you like. I will tell you if each set fits. This puzzle comes from a 1960 study by Peter Wason. It shows confirmation bias in action.
Your tests so far
What kind of tests did you run?
Tests made to fit your guess: 0Tests that could prove you wrong: 0
Step 1 · Make a first guess2, 4, 6 fits the secret rule