Question

If u={1,2,3,4,5.........20}
A={2,3,4,5,6,8,14,18}
B={1,7,9,11,13,19,20}
C={5,7,12,15,17,19}​

Answer 1

Answer:

what we have find u have not mentioned it post it again

Answer 2

Answer:

B =(1,7,9,11,13,19,20)