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What property is 12•13=13•12
asked
Feb 1, 2016
Mathematics
middle-school
2
answers
0
votes
203k
views
Tell whether the set is closed under the operation indicated. If not closed, provide a counterexample. 1.) integers under addition 2.) integers under division 3.) whole numbers under subtraction 4.) Irrational
asked
Feb 17, 2015
Mathematics
high-school
1
answer
2
votes
179k
views
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