Q. 25.0( 1 Vote )

# If X = {a, {b, c}

Given set X = {a, {b, c}, d}

Here a, d is the elements {b, c} is the set present in the X.

Subset:

A is subset to B if all the elements in the A presents in the B

E.g.,

A = {9,8,4,6,7} B = {1,2,3,4,5,6,7,8,9,}

Since all elements in A B

{a, b} is not subset because a is present in the set X but b is from other set and it is not an element in the set X

In the same way {b, c}, {c, d} are not subset of X.

But a, d both are elements of set X, so {a, d} X

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