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Topic: Disc.Math homework problem
Replies: 3   Last Post: Jan 23, 2013 4:51 PM

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J Cadman

Posts: 3
From: England, UK
Registered: 12/17/12
Re: Disc.Math homework problem
Posted: Dec 17, 2012 9:26 AM
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Use De Morgan's law to separate out all the 'ands', then

AD' + A'B' + B'D' = A'+D + A+B + B+D, notice that D+D=D and B+B=B, so the above becomes

A'+D + A+B which can be written as
(A'+D) + (A+B),
now use De Morgan on each bracket to obtain AD' + A'B'

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