Answer to the Friday Puzzle….

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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?

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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.

It’s the Friday Puzzle!

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cover Please do NOT post your answer, but do say if you think you have solved the puzzle and how long it took. Solution on Monday.

Two quick puzzles this week.

1) Can you use three 2s to create an expression (such as ’2+2+2′) that equals 11?

2) Can you use each of the digits 0-9 once to create an expression that equals 1?

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.