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UGC NET CSE | August 2016 | Part 3 | Question: 6

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The output of the following combinational circuit

is :

  1. $X . Y$
  2. $X + Y$ 
  3. $X \bigoplus Y$
  4. $X \bigoplus Y$
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In option D it should be complement of X⨁Y  which is the ans 

o/p of first NAND     gate    (x'y')'=x+y

o/p of second  NAND gate (xy)'=x'+y'

p/p of final NAND gate ((x+y)(x'+y')) ' =(xy'+yx')'=(x⨁y)'=x XNOR y option D 

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