There are 4 ways to pick the 1st digit (can't use 0 for the 1st digit). There are 4 remaining ways to pick the 2nd digit. Can pick 0, but not the digit picked for the 1st digit. There are 3 remaining ways to pick the 3rd digit. There are 2 remaining ways to pick the 4th digit. Answer: (4)(4)(3)(2) = 96 ways. Edwin