First, the tickets for the next event at the Edinburgh Secret Society go on sale at 10 a.m. today!
On Friday I posted this puzzle….
A lovely puzzle this week.
I have a box and inside the box are four stones. One stone is white, another is yellow, the third is blue and the fourth stone is also blue. I put my hand into the box and pick up two stones. I bring my hand out in a fist, look inside my fist and remove a blue stone. What are the chances of the other stone in my hand also being blue?
If you have not tried to solve it, have a go now. For everyone else, the answer is after the break.
There are 4 stones: W, Y, B1 and B2.
There are the following 6 possibilities for drawing 2 stones:
W-Y is eliminated, but all of the other possibilities involve at least 1 blue stone. However, only one of them involves 2 blue stones so the answer is 1 in 5. Did you solve it? Any other answers?
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). You can try 101 of the puzzles for free here.