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antiqueableLv1
13 Oct 2022
If
then decide if each of the following operations is defined (answer yes or no)
A+B ___
A+C ___
B+C ___
AB ___
BA ___
AC ___
CA ___
BC ___
CB ___
If
then decide if each of the following operations is defined (answer yes or no)
A+B ___
A+C ___
B+C ___
AB ___
BA ___
AC ___
CA ___
BC ___
CB ___
