Let A = {x : x is a prime number <10} and B={1,2,3,4}
i. Write A in tabular form.
ii. Find A - B and B - A.
iii. Find (A -B) `cup` (B - A)

Answer

i. A= {2,3,5,7}
ii. A - B = {2,3,5,7} - {1,2,3,4} = {5,7}
B - A = {1,2,3,4} - {2,3,5,7} = {1,4}
iii. (A-B) `cup` (B-A) = {5,7} `cup` {1,4} = {1,4,5,7}