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Let A = {7, 8, 9, 10, 11, 12} and B = {7...

Let A = {7, 8, 9, 10, 11, 12} and B = {7, 10, 14, 15}. What is the number of elements in (A-B) and (B-A) respectively ?

A

2 and 4

B

4 and 2

C

2 and 2

D

4 and 4

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