A large whiteboard has 2014+ signs and 2015- signs written on it. You are allowed to delete two of the symbols and replace them according to the following two rules.
(i) If the two delete symbols were the same, then replace them by +.
(ii) If the two delete symbols were different, then replace them by -.
You repeat this until there is only one symbol left. Which symbol is it?
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(i) if the two delete symbol were the same then replace them by +.
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