Tolongin ka plisss ga ngerti :(

bil cacah,, bilangan bulat positif berawal dari 0

0,1,2,3,4,....

A : x= 4n
      n = 0,  x = 0
      n = 1,  x = 4
      n = 2,  x = 8
      n = 3,  x = 12
      n = 4,  x = 16
      n = 5,  x = 20
      n = 6,  x = 24
      A = {0,4,8,12,16,20,24}

B : x = 6m
      m = 0, x = 0  
      m = 1, x = 6
      m = 2, x = 12
      m = 3, x = 18
      m = 4, x = 24

A U B = {0,4,6,8,12,18,20,24}