Final answer:
The number of different pin numbers possible on an iPhone with a 6-digit pin number is 1,000,000.
Step-by-step explanation:
The number of different pin numbers possible on an iPhone with a 6-digit pin number can be determined using the concept of permutations. Since each digit can be any number from 0 to 9, there are 10 choices for each digit. In a 6-digit pin number, there are 6 positions to fill. So, the total number of pin numbers is calculated as 10 x 10 x 10 x 10 x 10 x 10 = 1,000,000.