Question 33
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How many 4-digit PINs can be made from the digits 0 to 9 if digits may repeat?
- A 5,040
- B 9,000
- C 210
- D 10,000 Correct
Correct Answer: Option D
A PIN may start with 0
10⁴ = 10,000
Trap: 9,000 treats it as a 4-digit number.
Answer: 10,000
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