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-3/8 + 1/7 = 1/7 + (-3/8) is an example to show that

(a) addition of rational numbers is commutative.
(b) rational numbers are closed under addition.
(c) addition of rational number is associative.
(d) rational numbers are distributive under addition


The correct answer is option b: rational numbers are closed under addition
since -3/8+1/7 = 1/7 +(-3/8)

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