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How to find which is fallacy or which is tautology when big equation is given?

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A Tautology is any logical statement that always results in True. Example, the statement - "Malaria is dangerous" is always true. A Fallacy is a statement that always results in False. Example - "Toxic waste is easy to store" - is always false They are opposite of each other.

If you are given a statement and want to determine if it is a tautology, then all you need to do is construct a truth table for the statement and look at the truth values in the final column. If all of the values are T (for true), then the statement is a tautology.

 

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