Question

If A = {3, 6, 9, 12, 15, 18}, B = {4, 8, 12, 16, 20}, C = {2, 4, 6, 8, 10, 12} and D = {5, 10, 15, 20, 25}, find:

B - C

Answer 1

B={4,8,12,16,20} and C={2,4,6,8,10,12}
therefore,B-C={16,20}. DONE.

Answer 2

B-C is nothing but the elements which is present in B but not in C
B= {4, 8, 12, 16, 20}
C = {2, 4, 6, 8, 10, 12}

B - C = { 16,20}