Under which operation rational numbers are NOT closed?

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Subtraction

Addition

Division

Multiplication

answer is C.

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Detailed Solution

If we add, subtract, multiply any two rational numbers, we get a rational number (that is, rational numbers are closed under addition, subtraction, multiplication).
In case of division, if the divisor is 0 , the result of the division is no more a rational number.
Therefore, rational numbers are not closed under division.

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