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WORKBOOK



                                                         n(A  B)   n(A  B)   n(B  A ) 
               Example 42:  For the non-empty sets A and B,                             Find the least number of
                                                             3         5          6
               elements of  A   B.












               Example 43:  n(A  B) = 3 and   2 n      A   B    n      B    A are given. If the number of elements of

               A B is 1 less than the number of subsets of A – B, then find n(A B).









































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