A set B could contain all letters of the alphabet except a, f, and g.
B = U - {a, f, g}
"A set is a collection of well-defined objects or elements."
"A set which consists of all elements of other sets present in a Venn diagram."
"The intersection of two sets A and B is the set of all those elements which are common to both sets A and B."
Given sets are A={a, b, d, f, g} and B
universal set U={letters of alphabet}
A ∩ B = {b, d}
Since the intersection of the 2 sets A and B contains the elements b and d, the set B can contain all the letters of the alphabet except a, f, and g because the intersection does not contain those elements.
B = U - {a, f, g}
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