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# Opgave 1
Nope
# Opgave 2
Show that the following
R = ~(~(A * ~B) * ~(~A * B))
is XOR
Man kan skrive exclusive or som:
```
(A + B) * ~(A * B)
(A + B) * (~A + ~B)
A * ~A + A * ~B + B * ~A + B * ~B
A * ~B + B * ~A
~(~(A * ~B) * ~(~A * B))
```
yaay
# Opgave 3
Reduce the following
Jeg tager bare den først.
```
A * ~B * ~C + A * B * ~C + ~A * ~C
~C * (A * ~B + A * B) + ~A * ~C
~C * A + ~A * ~C
~C
```
# Opgave 4
Find expression
```
X = ~(A * B)
Y = ~(A * X)
Z = ~(B * X)
C = ~(Y * Z)
D = ~X
C = ~(~(A * ~(A * B)) * ~(B * ~(A * B)))
D = ~~(A * B) = A * B
```
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