Which of the following is not true?

Question:

 Which of the following is not true?

(a) rational numbers are closed under addition

(b) rational numbers are closed under subtraction

(c) rational numbers are closed under multiplication

(d) rational numbers are closed under division

Solution:

(d) Rational numbers are not closed under division.

As, 1 and 0 are the rational numbers but $\frac{1}{0}$ is not defined.

 

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