Question

Find the value of AB and BA if A=(2 3 4) B= (5 6 7 and 2 8 1).​

Answer 1

Answer:

By subtracting one set from another the thing you actually subtract is their common elements. What’s left is the unique elements of the set that was subtracted from.

A-B={2, 3} this means that the elements {2, 3} are not in B but in A since they were not subtracted.

B-A={1, 6, 8} means that the elements {1, 6, 8} are not in A but in B.

The only part remaining to figuring out the complete set of A and B is their common elements which is stated in AnB={4, 5}

So the answer is: A={2, 3, 4, 5} B={1, 6, 8, 4, 5}