cowhorses cowhorses 10-06-2017 Mathematics contestada How many different four-digit numbers can be made using the digits 1, 2, 3, 4, 5, 6 if no digit can be used more than once? A: 4C2 = 6 B: 6C4 = 15 C: 6P4 = 360 D: 6P4 = 12