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Z+= {1,2,3,4,5......}

A = {2,4,6,8,10,12,14,16,18}

B = {3,6,9,12,15,18,21,24,27}

A Ç B = B Ç A

   A Ç B = {2,4,6,8,10,12,14,16,18}  Ç   {3,6,9,12,15,18,21,24,27}

             = {6,12,18} ....... eq. (a)

  B Ç A = {3,6,9,12,15,18,21,24,27} Ç {2,4,6,8,10,12,14,16,18} 

             = {6,12,18} ....... eq. (b)

    from equation (a) and (b)

       A Ç B = B Ç A

U B = B U A

  A U B = {2,4,6,8,10,12,14,16,18}   U  {3,6,9,12,15,18,21,24,27}

             = {2,3,4,6,8,9,10,12,14,15,16,18,21,24,27} ....... eq. (c)

  B U A = {3,6,9,12,15,18,21,24,27} U {2,4,6,8,10,12,14,16,18} 

             = {2,3,4,6,8,9,10,12,14,15,16,18,21,24,27} ....... eq. (d)

    from equation (c) and (d)

    A U B = B U A


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