alleryThe set of rational numbers Q is CLOSED under all of the following operations EXCEPT:
AAddition of any two rationals
BDivision by zero
CMultiplication of any two rationals
DSubtraction of any two rationals
Answer & Solution
Correct answer: B. Division by zero
Rationals are closed under addition, subtraction, multiplication, and division (provided you do not divide by zero).
Division BY zero is undefined and breaks closure.
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