Math questions on closure sets ?

Posted on July 4, 2009
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Math questions on closure sets ?

1) under what operation is the set of positive rational numbers not closed
division
addition
subtraction
or multiplication
2) for what operation is the set of integers not closed
same choices as for number 1
3) which one of the following sets is not closed under addition
natural numbers
even integers
whole numbers
odd integers
1) Addition, multiplication , and division except where denominator is zero
2) division
3) odd integers are never closed under binary addition




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