Question

Please solve very fast
Determine whether each of the following closed for the given operation
1. the set of odd whole numbers for multiplication.
2.the set of whole numbers less than 100 for addition.
3. the set of all whole numbers whose units digits are 6 for multiplication.
4.the set of even whole numbers for multiplication.
5.the set of whole numbers less than 1000 for multiplication.
6.the set of whole numbers greater than 1000 for multiplication.​

Answer 1

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