# TIFR2015-A-4

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The Boolean function obtained by adding an inverter to each and every input of an $AND$ gate is:

1. $OR$
2. $XOR$
3. $NAND$
4. $NOR$
5. None of the above

edited
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@techbd123

@Satbir

I am getting $\mathbf{OR}$ as the answer.

Can you please check this once.

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it is called bubbled AND gate. answer is NOR.
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Yeah, I know that answer is NOR but the truth table represents OR gate as well.
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 A B C 0 0 0 0 1 1 1 0 1 1 1 1

I am getting this truth table after following what is said in the question.

So, why not OR gate.

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 $A$ $B$ $A'$ $B'$ $A'.B'$ 0 0 1 1 1 0 1 1 0 1 1 0 0 1 1 1 1 0 0 0

We are getting NOR as output

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Oh yes that was the mistake.

I was comparing with A and B and not A' and B'.

Thanks Man!!

Invert-AND = NOR

For example, $A'B' = \overline{A+B}$

$[$Note : Invert-OR = NAND, $A'+B' = \overline{A.B}]$

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