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18. A = {faktor dari 16}= {1,2,4,8,16}
      B = {x|x</5, x elemen bilangan asli} = {1,2,3,4,5} , </ = lbh kcl/sm dengan
     = A n B = {1,2,4} (c)
19. P = {1,2,3,4,5,6}
      Q = {2,3,5,7}
     = A u B = {1,2,3,4,5,6,7} (d)
20. P = {2,3,5,7}
      Q = {3,5,7,9}
    = P - Q = {2} (b)
21. A = {3,4,5,6,7}
      S  = {0,1,2,3,4,5,6,7,8,9}
     komplemen = {0,1,2,8,9} (b)
22. x + 8 = 25 + 12
      x + 8 = 37
      x = 37 - 8 = 29 orang (a)