- A5040
- B9000
- C40
- D10000
Step-by-Step Solution
Each of the 4 places has 10 choices, and 0 may come first in a PIN: . (5040 forbids repeats.)
Answer: D) 10000
A mobile PIN has 4 digits from 0 to 9, and digits may repeat. How many PINs are possible?
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