Tonight the Edinburgh Secret Society will be broadcasting their ‘Lafeyette Seance’ live on the web. More details here.
So, onto this weeks puzzle…..
On Friday I set this puzzle….
You are shown the four pieces of cardboard shown below.
You are told that each one is either red or green on one side, and that each one has either a circle or a square on the other side.
Which one(s) must you pick up and turn over in order to have sufficient information to answer the question: Does every red one have a square on its other side?
If you have not tried to solve it, have a go now. For everyone else, the answer is after the break.
Number 2 isn’t important as the question is only concerned with red cards. If Number 1 has a circle, the answer is no. If Number 3 is red, the answer is no. If Number 1 is a square, Number 3 is green, and Number 4 is either red or green, the answer is yes. Therefore the answer is Number 1 and Number 3.
Did you solve it? Any other solutions?
If you like the Friday Puzzles, I have produced an ebook containing 101 of the previous Friday Puzzles! It is called PUZZLED and is available for the Kindle (UK here and USA here) and on the iBookstore (UK here in the USA here). There is also a blog page containing 101 of the puzzles here.