How many four-digit even #s can be formed if no digit is repeated?
9x9x8x4=2592 ?
Find the # of seven-digit telephone #s that can be generated if both of the following conditions are met:
CONDITION 1: The first digit cannot be 0 or 1.
CONDITION 2: The first three digits cannot be the emergency # (911) or the # used for information (411).