MathDB
Multiple of 11

Source: 1985 National High School Mathematics League, Exam One, Problem 9

February 23, 2020

Problem Statement

In the given sequence 1,4,8,10,16,19,21,25,30,431,4,8,10,16,19,21,25,30,43, sum of a few adjacent numbers in the sequence is a multiple of 1111. The number of such number sets is________.
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