3 The following is a detail of an altered version of a painting by the artist Gene Davis This picture has been generated by the following rule There are a total of 24 vertical stripes on a black background consisting of four patterns in each of which you have three vertical grey stripes followed by three closely spaced stripes of different colors Each colored stripe can be teal light blue dark blue lilac yellow or maroon so long as no color repeats in any group of three You were planning to open a huge gallery showing every possible painting satisfying this rule but your sponsors refused to go ahead because of the sheer size of the gallery you would need so you eliminated all paintings that had orange or light blue stripes and were allowed to go ahead with the smaller collection In the grand opening a photographer takes a picture of one of the paintings at random What is the probability that it is the very picture shown above Solution