1.

Suppose U = {1, 3, 9, 11, 13, 18, 19}, and B = {3, 9, 11, 13}. Find (B’)’ and draw the inference.

Answer»

U = {1, 3, 9, 11, 13, 18, 19},

B= {3, 9, 11, 13} ….(i)

∴ B’= {1, 18, 19} 

(B’)’= {3, 9, 11, 13} ….(ii) 

∴ (B’)’ = B … [From (i) and (ii)] 

∴ Complement of a complement is the given set itself.



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