Question: 1. How do you distinguish between positive and negative logic systems? Prove that an OR gate in a positive logic system is an AND

1. How do you distinguish between positive and negative logic systems? Prove that an OR gate in a positive logic system is an AND gate in a negative logic system. 2. Give brief statements that would help one remember the truth table of AND, NAND, OR, NOR, EX-OR and EX-NOR logic gate functions, irrespective of the number of inputs used. 3. Why are NAND and NOR gates called universal gates? Justify your answer with the help of examples.

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