Find the sum of all four digit numbers formed using the digits 1,2,4 and 6 .
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Correct answer: A. 86,658
Explanation
There are 4! = 24 numbers; each digit appears 6 times in each place. Sum = 6 × (1 + 2 + 4 + 6) × 1111 = 6 × 13 × 1111 = 86,658.
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