How many different 3-digit PIN codes using only the digits 0-9 are possible?

By comparison, this 3-dial lock (three wheels, each with digits 0-9) has 10 × 10 × 10 = 1, 000 possible combinations.

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Step-by-step explanation:

If what you want are all possible three digit numbers with no repetition of the digits then you have 10 choices for the first digit, you have 9 choices for the 2nd digit, and you have 8 choices for the 3rd digit giving you 10x9x8 = 720

With repetition = 10×10×10=1000

y > 1/3x

y < = -x + 4

hope this : )