WMC 2018 Pursuit - Pack 2, C3
Algebra
Level
pending
What is the total sum of the product of the digits of all four-digit numbers?
The answer is 4100625.
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1 solution
( 1 + 2 + 3 + . . . + 8 + 9 ) 4 = 4 1 0 0 6 2 5