4. 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.
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a. it is true, as rational number are closed under additional
b.true , as rational number are closed under subtracting
c.true , as rational number are closed under multiply
d. false , as rational number are not closed under division
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