if we exclude 0 then the collection of all other rational number is closed under division it is true
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We know that rational numbers are closed under addition,subtraction and multiplication.
In case of division, if 0 is excluded from the set of rational number then they are closed under division too.
This is because, for any rational number "a",a÷0 is not a rational number.
Thus, in general, if 0 is excluded from the set of rational numbers, then closure property holds true for all the four basic operations.
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