It’s the Friday Puzzle!

cover

First, alas I won’t be able to make it to the Amazing Meeting this year because of a clash of dates.  Sorry about that.  It’s a wonderful convention, and if you are into science and skepticism it’s a great place to be.

OK, here is the Friday puzzle!  Solution on Monday.

John and Joan decide to play several games of cards, with a stake of £1 per game.  After several games John has won three games and Joan has won £3.  How many games did the two of them play?

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.

Answer to the Friday Puzzle….

69

coverOn Friday I set this puzzle.  If you have not tried to solve it, have a go now.  For everyone else the answer is after the break.

Imagine that you have a coin that is biased – that is, in a long series of tosses it won’t come up with 50% heads and 50% tails.  Alas, you don’t know the extent of the bias.  How can you use the coin to generate a random series of zeros and ones?

Continue reading

It’s the Friday Puzzle!

coverHere is the Friday puzzle!  Solution on Monday.

Imagine that you have a coin that is biased – that is, in a long series of tosses it won’t come up with 50% heads and 50% tails.  Alas, you don’t know the extent of the bias.  How can you use the coin to generate a random series of zeros and ones?

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.

It’s the Friday Puzzle!

coverHere is this week’s puzzle. Solution on Monday.

Can you circle exactly four of these numbers such that the total is twelve?

puzzle1

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.