Problema Solution
the set of odd integers is closed under the operation of
Answer provided by our tutors
If you add 1 + 3 you get a non-odd number, so Addition is not closed.
If you subtract 3 - 1 you get a non-odd number, so subtraction is not closed.
If you multiply two odd numbers, you always get an odd number, so multiplication is indeed closed.
If you divide 7 into 5 you get something that isn't an odd number, so it is not closed.
So only muliplication is closed.