Answer = 2n + 1 Cardinality is the number of elements in a given mathematical set. In this set,the cardinality is 2n + 1 Explanation the n is a certain number and also in this set it has both negative and positive n Before the number of elements in this set excluding one (which is 0 is 2n then the other one is added Hence the cardinality is 2n + 1
