Chosen Answer: Nice question! An interesting test for divisibility by 11 is to alternately add and subtract the digits. The divisibility of the result by 11 determines the divisibility of the original number by 11. Effectively, you can separate the digits into two lists of length 4 and then 3, eg. [1, 3, 4, 2] [...]
Posts Tagged ‘subtract’
How many seven digit numbers ,divisible by eleven can be formed using 1,2,3,4,5,6,7?
Posted by Eleven2 on November 22nd, 2011
Posted in Eleven2 FAQ 
Tags: alternately, answer, chosen, determines, digit, divisibility, divisible, effectively, eleven, formed, interesting, into, length, lists, many, nice, number, original, question, result, separate, seven, subtract, test, using 
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