1, 2, 3, 6, 12, ? Answer is not 18. Many failed this American IQ Test! Can you?

[@tonypedrosa7260]

24

[@saisrilakshmisaisrilakshmi8269]

13

[@manuelquitevis6794]

12 x 2 =24

[@vespa2860]

How do you get 2?

[@GilaniSir]

Discovered New Method to Identify Square Number In 1 Second Just By Seeing Last 2 Digit