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Neither a borrower nor a lender be, (Posted on 2014-07-01) Difficulty: 3 of 5
Despite the advice given by Polonius we sometimes need to "borrow" during the subtraction process, so while 345-122 is achieved without "borrowing", 322-145 needs two acts of "borrowing".

Having stated the above, please find the largest set of 3-digit numbers, such that for any pair(a,b; a>b) of members of the set the operation a-b cannot be done without borrowing.

Based upon a NSH contest problem.

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
QuestionNSH?Steve Herman2014-07-02 08:22:35
SolutionMy solutiontomarken2014-07-01 14:23:12
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