What is the Boolean expression for the given logic diagram?

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LPSC ISRO Technical Assistant Electronics 07 Aug 2016 Official Paper
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  1. A NAND B
  2. A XNOR B
  3. A XOR B
  4. A NOR B

Answer (Detailed Solution Below)

Option 3 : A XOR B
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Detailed Solution

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Concept: 

For a 2 × 1 MUX is shown above, the output function F is expressed as:

F = S̅1 I0 + S1I1

i.e. when S1 = 0, I0 is transmitted to the output.

And when S1 = 1, I1 is transmitted to the output.

Application:

For the given MUX, the output expression will be:

Y = A̅ B + AB̅ 

Y = A XOR B

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