Search All of the Math Forum:
Views expressed in these public forums are not endorsed by
NCTM or The Math Forum.


Math Forum
»
Discussions
»
Math Topics
»
discretemath
Notice: We are no longer accepting new posts, but the forums will continue to be readable.
Topic:
Disc.Math homework problem
Replies:
3
Last Post:
Jan 23, 2013 4:51 PM



J Cadman
Posts:
3
From:
England, UK
Registered:
12/17/12


Re: Disc.Math homework problem
Posted:
Dec 17, 2012 9:26 AM


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'



