I need help solving this question, i need to understand this and need workings from someone.

List the elements in the set and then count them. Exactly where are you having trouble?
 
I got th
Subhotosh Khan said:
As I see it, 2 and 17 are not included in the set A.

Please show us what you have tried and exactly where you are stuck.

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My answer is 7 i got the answer. cardinality is 7 because 2 and 17 is excluded and x is even so i got the answer that way.
 
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