If set A = {4, 6, 8} and set B = {0}, then A ∪ B is :

1. {4, 6, 8}

2. {4, 6, 8, 0}

3. { }

4. none of these

If set A = students in class 8 of a particular school and set B = students of this school, then :

1. A = B

2. n(A) = n(B)

3. A ⊂ B

4. B ⊆ A

If universal set = N, the set of natural numbers, set A = {multiples of 3 less than or equal to 20}
and
Set B = {multiples of 4 less then or equal to 20}, then A - B is equal to :

1. {3, 6, 9, 15, 18}

2. {4, 8, 16, 20}

3. {0}

4. {12}

Find all the subsets of A = {5, 7} .