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Is the sum odd? (Posted on 2016-06-08) Difficulty: 3 of 5
Consider a set of all 9 digit numbers composed of 9 distinct non-zero digits (e.g. 546327891).
An unordered pair chosen from the above set may sum to 987654321.

Without performing exhaustive search, prove that the number of such pairs is odd.

No Solution Yet Submitted by Ady TZIDON    
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  Subject Author Date
An ideaarmando2016-06-09 10:46:56
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