Average of digits!
Algebra
Level
3
Find the
average
of all the 4-digit positive integers that can be formed using each of the digits
3,5,7,9
exactly once in each number.
The answer is 6666.
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1 solution
There will be an equal number of digits in each on the places (4!=24). So, average of each of these places is 4 3 + 5 + 7 + 9 = 6 and the number is 6 6 6 6 .