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A = {3, 6, 9, 12, 15, 18, 21}, B = { 4, 8, 12, 16, 20 }, C = { 2, 4, 6, 8, 10, 12, 14, 16 }, D = {5, 10, 15, 20 } The given operations are done as follows (i) A – B  = {3,6,9,15,18,21}                                    (vii) B – C = {20} (ii) A – C = {3,9,15,18,21}                                       (viii) B – D =  {4,8,12,16}      (iii) A – D = {3,6,9,12,18,21}                             ...
Here, {x : x is an even integer }      and      {x : x is an odd integer}          {2,4,6,8,10,..........}         and     {1,3,5,7,9,11,.....}  {2,4,6,8,10,..........}  {1,3,5,7,9,11,.....} =  Hence,it is disjoint set.  
Here,   { a, e, i, o, u }     and     { c, d, e, f } { a, e, i, o, u }  { c, d, e, f } = {e} Hence,it is not disjoint set.
Here,       {1, 2, 3, 4}     and     {4,5,6}       {1, 2, 3, 4}  {4,5,6}  =  {4} Hence,it is not a disjoint set.  
Here, A = {1,2,3,4,5,6...........}           B = {2,4,6,8,10...........}          C = {1,3,5,7,9,11,...........}          D = {2,3,5,7,11,13,17,......} (i) A  B = {2,4,6,8,10........} = B (ii) A  C = {1,3,5,7,9.........} = C (iii) A  D  = {2,3,5,7,11,13.............} = D (iv) B  C  =  (v) B  D  = {2} (vi) C  D = {3,5,7,11,13,..........} =       
Here,  A = { 3, 5, 7, 9, 11 },  B = {7, 9, 11, 13},    C = {11, 13, 15}  and    D = {15, 17} (i) A  B = {7,9,11}                                        (vi) A  (B  C)  = {7,9,11}  (ii) B  C   =  { 11,13}                                    (vii) A  D =  (iii) A C  D =                                           (viii) A  (B  D) = {7,9,11}   (iv) A  C   = { 11 }                                     ...
(i) X = {1, 3, 5}   Y = {1, 2, 3}     X  Y = {1,3} (ii) A = [ a, e, i, o, u}    B = {a, b, c}     A  B = {a} (iii) A = {x : x is a natural number and multiple of 3}     B = {x : x is a natural number less than 6}       A = {3,6,9,12,15.......}             B = {1,2,3,4,5}      A  B = {3} (iv)A = {x : x is a natural number and 1 x 6 }         B = {x : x is a natural number and 6  x  10 }       A...
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