If you had an inking of biology, you would know that mutations are not random. As in the output of a dice that has sides numbered 1 to 6, ONLY 1,2,3,4,5,6 are possible outcomes. Nine is not a possibility.
That is pretty much the stupidest bit of mathematical reasoning I've ever seen. You failed to mention other possibilities. How about 1A, 1B, 1C, etc.