Belongs to Vs. Subset of

Given, Set A={1,2,3 ,4,{5,6},6,7} Belongs to () Subset of () 1  A 2  A 3  A 4  A {5,6}  A 6  A 7  A 8  A {1}  A {2}  A {3}  A {4}  A {{5,6}}  A {6}  A {7}  A {8}  A B={1,2,3,4,5,6}, Is Set B Subset of A. B is not a subset of A, because element {5, 6} does not contain in Set B & element 5 does not contain in Set A.

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