Options:
A.
B.
C.
D.
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Earlier discussion
2 older comments kept for context.
Raphael Ubagbo
Or if the question is around in this form (P n Q)' the answer will be
U=[a,b,c,d,e,f]
P=[b,c]
Q=[c,d]
P n Q = [c]
Therefore, (P n Q)' = [a,b,d,e]
By De morgan law (P n Q)' =P' U Q'
Raphael Ubagbo
The answer is not there..
By De Morgan Law
A' n B'= (A U B)'
Therefore the ans: ( b,c,d)