If you go out on the number line to find the best starting spot for 3,5,7 and 11, that number will be relatively prime to 3,5,7 and 11. It will be of the form (3K+r1), (5K+r2), (7K+r3), and (11K+r4). It is relatively easy to think of starting from 0 and crossing out numbers of the form...