How good are you at generating random numbers?

Indulge me in a little magic trick. Reach into your pocket (or purse), and pull out a coin. In a moment, I知 going to ask you to flip that coin a few times and record the order that the coin lands heads or tails . Record the results you obtain in one of the boxes below by entering a sequence of letters H and T e.g. HTHHTHT …

It does not matter which box you use. I hope you値l agree that flipping an (unbiased) coin is a pretty fair random number generator.