Which property: $\dfrac{a}{b} + \dfrac{c}{d} = \dfrac{c}{d} + \dfrac{a}{b}$ for all rationals?

Which property: $\dfrac{a}{b} + \dfrac{c}{d} = \dfrac{c}{d} + \dfrac{a}{b}$ for all rationals?
  1. Commutative
  2. Associative
  3. Distributive
  4. Closure

Solution

Order of addition does not matter — commutative property of addition.

Asked in: IMO

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