natural number from 1 to 2013 are written in a series. Can we get its sum zero by placing + or - sign between them? If yes then by how many + and how many -? If no why? Justify your answer with proper logic.

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TopNewestNo. Consider parity 2. – Pi Han Goh · 3 years, 4 months ago

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– Parv Parkhiya · 3 years, 4 months ago

Sorry, I don't get it...."consider parity 2." ???????????Log in to reply

LHS mod 2 = 1, RHS mod 2 = 0, contradiction – Pi Han Goh · 3 years, 4 months ago

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