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Last but not the least (Posted on 2013-12-12) Difficulty: 2 of 5
Numbers 1, 2, 3, ... 2014 are written on a board.
You are allowed to replace any two of these numbers by a new number, which is either the sum or the difference of these numbers.

Show that after 2013 times performing this operation, the only number left on the board cannot be zero.

See The Solution Submitted by Ady TZIDON    
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  Subject Author Date
Gilding the LilySteve Herman2013-12-13 10:07:21
re(5): All things being equal ... (spoiler)Ady TZIDON2013-12-13 02:08:02
re(4): All things being equal ... (spoiler)Ady TZIDON2013-12-13 02:04:50
re(4): All things being equal ... (spoiler)Charlie2013-12-13 01:54:49
re(3): All things being equal ... (spoiler)xdog2013-12-12 18:19:21
re(2): All things being equal ... (spoiler)Charlie2013-12-12 11:13:20
re: All things being equal ... (spoiler)xdog2013-12-12 10:58:22
SolutionAll things being equal ... (spoiler)Steve Herman2013-12-12 10:02:57
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