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which one is correct according to addition property of equality

  1. 9 + 2 = 9-2
  2. 2+3+4 =4+2
  3. 20+10 =10+20
  4. 12-10 =2

The correct answer is: 20+10 =10+20


    20+10 =10+20 as the property states: a+b =b+a

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