Answer
(A∩B∩C)'= {1,2,4,5,6,7}
Work Step by Step
U={1,2,3,4,5,6,7}
A={1,3,5,7}
B={1,2,3}
C={2,3,4,5,6}
TO FIND (A∩B∩C)' Let's first find A∩B∩C
A∩B∩C={1,3,5,7} ∩ {1,2,3} ∩ {2,3,4,5,6} = {3}
(All the common elements of A, B & C)
(A∩B∩C)'= {1,2,4,5,6,7}
(All the elements of universal set U which are not there in (A∩B∩C))
