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Best answer 2 votes 2 votes The cardinality of the empty set is 0 and the cardinality of a finite set is the number of elements in the set. so if ur set contains phi as an element then cardinality is 1... sudsho answered Jan 3, 2017 • selected Jan 3, 2017 by focus _GATE sudsho comment Share Follow See 1 comment See all 1 1 comment reply Wanted commented Jan 3, 2017 reply Follow Share what is difference here powerset of {1,2,3} and powerset (1,2,3) nd ({1,2,3})? 0 votes 0 votes Please log in or register to add a comment.