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Because dividing any rational number by zero is not defined, the set is not closed under:

ADeduction
BDoubling
CDecimals
DDivision
Answer & Solution
Correct answer: D. Division
1. Every other operation stayed inside the set. 2. One case here has no answer at all. 3. So they are not closed under division. _Source: syllabus Mathematics Class VIII, Chapter 1, Rational Numbers._
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