Sunday, May 16, 2004

A Quick Puzzle

A little something to jog the old brain cells on a lazy Sunday afternoon.

You are presented with a list of all the numbers from 1,111,111 to 9,999,999, all neat and in order. Thanks to an accident involving a hypnotist, you have taken against the digit 5, so you assiduously strike out each number in the list that contains a 5 anywhere in it. Estimate what fraction of the original numbers remains.