Question 837367: Find the mean of all the three-digit counting numbers with 24 as the sum of the digits
Answer by richard1234(7193)   (Show Source):
You can put this solution on YOUR website! 996, 969, 699
987, 978, 897, 879, 798, 789
888
Notice that each of these three rows average to 888. This works since we are cycling through all permutations of the digits, and the average "value" of each digit is 8.
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