Answer
C∩ ∅ = {} = ∅
Work Step by Step
U = {a,b,c,d,e,f,g,h}
C = {b,c,d,e,f}
The set C∩ ∅ represents the elements which are common in both C and ∅.
(∅ represent empty set)
Therefore the common elements of C and ∅ is an empty set.
Therefore C∩ ∅ = {} = ∅
