Question 4
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What is the sum of all 4-digit numbers that can be formed with the digits 1, 2, 3, 4 using each exactly once?
- A 6,666
- B 66,660 Correct
- C 33,330
- D 1,11,100
Correct Answer: Option B
Each digit appears 3! = 6 times in each place
Sum = 6 × (1 + 2 + 3 + 4) × 1,111 = 66,660
Answer: 66,660
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