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MathNet 2018-part-07 — 177 problems (EN–VI) Question 31

Math Olympiad Vault · MathNet 2018-part-07 — 177 problems (EN–VI)

Question 31

How many ordered sequences of 36 digits have the property that summing the digits to get a number and taking the last digit of the sum results in a digit which is not in our original sequence? (Digits range from 0 to 9.)