Simplify ((A U B') n C) U(A'n B)' and write the dual of the result.
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[(A U B') n C] U(A'n B)'
[(A n C) u (B' n C)] u (A' n B)'
(A n C) u (B' n C) u (A' n B)'
(A n C) u (B u C')' u (A' n B)'
(A n C) u [(B u C') n (A' n B)]'
(A n C) u [(B n A' n B) u (C' n A' n B)]'
(A n C) u [(A' n B) u (A' n B n C')]'
(A n C) u (A' n B)'------*
[(A n C) u A] n [(A n C) u B']
=A n [(A n C) u B']-----**
Recall that
A'' = A
A n (B u C) = (A n B) u (A n C)
(A u B)' = A' n B'
If A B ; then A n B = A
If A B ; then A u B = B