Question 17
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How many 4-digit numbers contain at least one digit 7?
- A 5,832
- B 3,168 Correct
- C 2,916
- D 3,000
Correct Answer: Option B
All 4-digit numbers: 9,000
With no 7: 8 × 9 × 9 × 9 = 5,832
9,000 − 5,832 = 3,168
Trap: 5,832 is the count without a 7.
Answer: 3,168
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