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set (N,*) , (Z,*) closed or not ?

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closed- what that means for every two elements from the set A when operated by the given operation give an output which belongs to the same set A. In your question both are closed because you take any two elements and operate you will get an element in the set.

Example:

(N,*) 5 * 2 = 10

(Z,*) -3 * 0 = 0
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