There are 4 cards on a table. The cards have an image on both sides. This can either be a triangle, square, circle or star.
The first card has a star on the up-sideThe second has a circle on the up-sideThe third a triangleThe fourth a squareSomeone claims that if there is a triangle on the up-side, there is a star on the down side.How many cards do you have to flip over to check this out?Please explain why, since there are only 5 possible answers.
wait, the third has a triangle on the up side?
wow, confusing…
Are you sure you've given the whole riddle? Couldn't you just flip two cards (the one with the triangle, and the one with the star) to check?
2, first and third.
1st the 3rd and the first 3…….
Yes, on the up-side, no right answers so far
AH! I got it! No one will ever know, because if you flip the card over then the triangle will be on the top (no longer on the bottom). You can never know what is on the bottom without prior knowledge.
Umm…. the 3rd one…
It's the only one a triangle on the up-side, so it's the only one you need to check. If it doesn't have a star on the down-side, then that person is wrong.