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What is meant by tautology and fallacy? Prove that 1 + Y is a tautology and 0 . Y is a fallacy.

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If result of any logical statement or expression is always TRUE or 1, it is called Tautology and if the result is always FALSE or 0 it is called Fallacy.

We will prove 1 + Y is a tautology with the help of truth table which is given below :

1 y R
1 0 1
1 1 1

From truth table it is prove that 1 + Y is a tautology.

We will prove 0 . Y is a fallacy with the help of truth table which is given below :

0 y R
0 0 0
0 1 0

From truth table it is prove that 0 . Y is a fallacy.

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