The difference between the last digit and the rest of the number is a multiple of 11
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The difference betweenthe sum of the digits in odd positions andthe sum of the digits in even positionsis divisible by 11.
12
Three
Divisibility rules have been developed and refined by mathematicians over the centuries. It is difficult to attribute the invention of divisibility rules to a specific individual. However, some early rules can be traced back to ancient civilizations like the Egyptians, Babylonians, and Greeks. These rules were further expanded upon and formalized by various mathematicians throughout history.
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