1.

Identify the property used in the following:a) 13/21+(-13/21)=0=(-13/21)+13/21b) 4/11+3/7=3/7+4/11c) 2/3+(4/5+-6/7)=(2/3+4/5)+-6/7​

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ANSWER:

this is a WRONG QUESTION DUDE i THINK so



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