Randomly scramble the digits 0, 1, 2, 3, 4, 5 and 6 to form a seven-digit number (or a six-digit number if the leading digit is 0). Rank the following events in order ...
Between 929, 718, 646, and half a dozen more triple-digit arrangements, New York City is a thicket of area codes. They abut, interlock, and overlap to the general confusion of callers and caller ID ...