Problem 7 - Entrance Test

The difference between sets A = { 1, 2, 3, 4 } and B = { 3, 4, 5 } is:

A. { 1, 2 }B. { 3, 4 }C. { 1, 2, 5 }D. { 5 }

Correct: A

The difference A - B includes elements in A not in B; 1 and 2 remain.