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We are always afraid of negative sign.The history books tells us that Julius Ceaser was born in 100 BC, not - 100. Some times, we say it is -5 degrees outside, but many prefer to say 5 below zero. Sub ground floors in a mall are sometimes called B1,B2 instead of -1,-2. There is something unpleasant about minus sign. Why minus multiplied minus is plus. Let us try to answer this enigma. We know 1*3 is 1+1+1. ok. Similarly -1...
