Question

Find the largest natural number in which all digits are distinct, and if you look at every 3 consecutive digits, you get a number divisible by 13.

Number Theory -> Modular Arithmetic / Remainder Arithmetic -> Divisibility Rules -> Divisibility Rule by 11 Combinatorics -> Case Analysis / Checking Cases -> Processes / Procedures

Sources:

Beno Arbel Olympiad, 2017, Grade 8 Question 7

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