Answer
A∩B∩C = {f}
Work Step by Step
A∩B∩C.
A∩B∩C represents the regions common to all three set A and set B and set C.
From the given Venn diagram,
the regions V represents the set A∩B∩C.
now the elements of the region V are f.
A∩B∩C = {f}

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