Let A = {x: x is a digit in the number 3591}, B = {x: x ? N, x

1.	Let A = {x: x is a digit in the number 3591}, B = {x: x ? N, x
A.	A? B = {1,3,5,9}
B.	A-B = {2,4,6,7,8}
C.	A U B = {1,2,3,4,5,6,7,8,9}
D.	none of these
Answer» C. A U B = {1,2,3,4,5,6,7,8,9}

Discussion

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