Question

find the cardinality of x , if x={-n,...,-2,-1,0,1,.....n}
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Answer 1

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