I quite like logic puzzles and hopefully you havent seen them, ill start off with the Wason selection task, simple yet hard-
[wikipedia]
Devised in 1966 by Peter Cathcart Wason,[1][2] the Wason selection task is a logical puzzle which is formally equivalent to the following question:
You are shown a set of four cards placed on a table each of which has a number on one side and a coloured patch on the other side. The visible faces of the cards show 3, 8, red and brown. Which cards should you turn over in order to test the truth of the proposition that if a card shows an even number, then its opposite face shows a primary colour?
A response which identifies a card which need not be inverted, or a response which fails to identify a card which needs to be inverted are both incorrect.
[wikipedia]
Devised in 1966 by Peter Cathcart Wason,[1][2] the Wason selection task is a logical puzzle which is formally equivalent to the following question:
You are shown a set of four cards placed on a table each of which has a number on one side and a coloured patch on the other side. The visible faces of the cards show 3, 8, red and brown. Which cards should you turn over in order to test the truth of the proposition that if a card shows an even number, then its opposite face shows a primary colour?
A response which identifies a card which need not be inverted, or a response which fails to identify a card which needs to be inverted are both incorrect.