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From the following tables

Two bits equality detector:

x1 x2 y1 y2 f
0 0 0 0 1
0 0 0 1 0
0 0 1 0 0
0 0 1 1 0
0 1 0 0 0
0 1 0 1 1
0 1 1 0 0
0 1 1 1 0
1 0 0 0 0
1 0 0 1 0
1 0 1 0 1
1 0 1 1 0
1 1 0 0 0
1 1 0 1 0
1 1 1 0 0
1 1 1 1 1

Min-term expresson:

x y f min-term
0 0 0 -------------
0 1 1 x'$\cdot$y
1 0 1 x$\cdot$y'
1 1 0 -------------

$f=\sum all the midterms = \bar{x}\cdot y+x\cdot \bar{y}$

Max-term expression:

x y f max-term
0 0 0 $x + y$
0 1 1 --------------
1 0 1 --------------
1 1 0 $\bar{x} + \bar{y}$

$f=\prod all the maxterms=(x+y)(\bar{x}+\bar{y})$

Write down the min-term expression of the f output of two bits equlity detector.

Write down the max-term expression of the f output of the truth table below:

x y f
0 0 0
0 1 1
1 0 0
1 1 1
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min-term expression of the f output of two bits equlity detector: 

${X1}'$${X2}'$${Y1}'$${Y2}'$ + ${X1}'$${X2}$${Y1}'$${Y2}$ + ${X1}$${X2}$${Y1}$${Y2}$ + ${X1}$${X2}'$${Y1}$${Y2}'$

 =>${X1}'$${Y1}'$ ( ${X2}'$${Y2}'$ + ${X2}$${Y2}$ )  + ${X1}$${Y1}$ ( ${X2}'$${Y2}'$ + ${X2}$${Y2}$ )

=>  (${X2}$  $\bigodot$ ${Y2}$ ) * (${X1}$  $\bigodot$ ${Y1}$ ) 

max-term expression of the f output of the truth table IS  = > F=Y 

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