1 is an odd number
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You can't. Adding any two odd numbers always gives an even number, which is not a member of the set of odd numbers.
Let + (addition) be a binary operation on the set of odd numbers S. The set S is closed under + if for all a, b ϵ S, we also have a + b ϵ S. Let 3, 5 ϵ the set of odd numbers 3 + 5 = 8 (8 is not an odd number) Since 3 + 5 = 8 is not an element of the set of the odd numbers, the set of the odd numbers is not closed under addition.
the set of odd numbers is infinite
Yes the same as even numbers are in an infinite set
i only know this odd number its 17, 15.