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Because 3 times 7 is a whole number for every such pair, whole numbers are closed under:

AMeasurement
BMultiplication
CMagnification
DModification
Answer & Solution
Correct answer: B. Multiplication
1. The product stays a whole number. 2. Closure again holds. 3. So they are closed under multiplication. _Source: syllabus Mathematics Class VIII, Chapter 1, Rational Numbers._
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