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Here,B = {3, 4, 5, 6},          C = {5, 6, 7, 8 } and           D = { 7, 8, 9, 10 } The union can be written as   B  C  D = {3,4,5,6,7,8,9,10}
Here, A = {1, 2, 3, 4}, B = {3, 4, 5, 6} D = { 7, 8, 9, 10 } The union can be written as A  B  D = {1,2,3,4,5,6,7,8,9,10}  
Here, A = {1, 2, 3, 4}, B = {3, 4, 5, 6}, C = {5, 6, 7, 8 } The union can be written as  A  B  C = {1,2,3,4,5,6,7,8}
Here, B = {3, 4, 5, 6} D = { 7, 8, 9, 10 } B  D = {3,4,5,6,7,8,9,10}
Here,  B = {3, 4, 5, 6}, C = {5, 6, 7, 8 } The union of the given sets are B  C = { 3,4,5,6,7,8}
Here, A = {1, 2, 3, 4} C = {5, 6, 7, 8 } The union can be written as follows A  C = {1,2,3,4,5,6,7,8}  
Here, A = {1, 2, 3, 4}  B = {3, 4, 5, 6} The union of the set can be written as follows  A  B = {1,2,3,4,5,6}
If A is subset of B then A  B will be set B.
Here, We can see elements of A lie in set B. Hence, A  B. And, A  B = {a,b,c} = B
Here, A = {2,3,4,5,6} B = {7,8,9} A  B = {2,3,4,5,6,7,8,9} or it can be written as A  B = {x : x is a natural number and 1 x 10 }  
Here, { 2, 6, 10 } and { 3, 7, 11} { 2, 6, 10 }   { 3, 7, 11} =  Hence,these are disjoint sets. So,statement is true.
Here,  { 2, 6, 10, 14 }         and         { 3, 7, 11, 15} { 2, 6, 10, 14 }   { 3, 7, 11, 15} =  Hence, these are disjoint sets. So,given statement is true.
Here,     { a, e, i, o, u } and { a, b, c, d } { a, e, i, o, u }  { a, b, c, d } = {a} Hence,these are not disjoint sets. So, statement is false.
Here,  { 2, 3, 4, 5 } and { 3, 6} { 2, 3, 4, 5 }  { 3, 6} = {3} Hence,these are not disjoint sets.  So,false.
R = set of real numbers. Q = set of rational numbers. R - Q = set of irrartional numbers.
X= { a, b, c, d }                and              Y = { f, b, d, g} (i) X – Y = {a,c} (ii) Y – X = {f,g} (iii) X  Y = {b,d}
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