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FInd the arithmetic mean of all 3-digit numbers whose digits are distinct and nonzero

MacTyBoys Dec 24, 2018

#1**+1 **

These are the 3-digit numbers that satisfy the given conditions:

[123, 124, 125, 126, 127, 128, 129, 139, 149, 159, 169, 179, 189, 289, 389, 489, 589, 689, 789]

These are the sums of above 3-digit numbers that satisfy the given conditions:

( 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24)

These are the "arithmetic means" of the above sums:

(2, 2.333333333, 2.666666667, 3, 3.333333333, 3.666666667, 4, 4.333333333, 4.666666667, 5, 5.333333333, 5.666666667, 6, 6.333333333, 6.666666667, 7, 7.333333333, 7.666666667, 8)

Guest Dec 24, 2018