The total number of subsets is 2^n = 2^2 = 4. Proper subsets exclude the set itself, so there are 4 - 1 = 3 proper subsets.

The empty set has exactly one subset, which is itself (∅).

The number of subsets of a set with n elements is 2^n. Here, n = 3, so 2^3 = 8.

The number of subsets of a set with n elements is 2^n. Here, n = 5, so 2^5 = 32.

The number of subsets of a set with n elements is 2^n. Here, n = 5, so the number of subsets is 2^5 = 32.

The number of subsets of a set with n elements is 2^n. Here, n = 4, so the number of subsets is 2^4 = 16.

The power set of the empty set contains only the empty set itself: {∅}.

The power set of F = {a} is {∅, {a}}.

The power set of G = {1} is {∅, {1}}.

The power set of a set with n elements has 2^n elements. For {1, 2}, the power set is {∅, {1}, {2}, {1, 2}}.

The empty set has exactly one subset, which is itself: ∅.

The total number of subsets is 2^5 = 32.

The union of two sets includes all unique elements from both sets. Thus, I ∪ J = {1, 2, 3}.

The union of two sets includes all elements from both sets without duplicates. Thus, {1, 2} ∪ {2, 3} = {1, 2, 3}.

The union of two sets is the set of elements that are in either set. Here, {a, b} ∪ {b, c} = {a, b, c}.

A subset is a set that contains elements from another set. {1, 2} is a subset of {1, 2, 3}.

A subset can only contain elements that are in the original set. {x, y} is a valid subset of {x, y, z}.

The set {d} does not contain any elements from {a, b, c}, so it is not a subset.

The power set of F = {1, 2} is {{}, {1}, {2}, {1, 2}}.

The power set of F = {a, b} is {∅, {a}, {b}, {a, b}}.

A universal set contains all elements under consideration. Here, {1, 2, 3} contains all elements from both A and B.

The power set of a set with n elements has 2^n subsets. For G, n=2, so the power set is {∅, {x}, {y}, {x, y}}.

The power set of {1, 2} is {{}, {1}, {2}, {1, 2}}.

A subset can only contain elements from the original set. {5} is not a subset of {1, 2, 3, 4}.

The set {0} is not a subset of the natural numbers, as natural numbers start from 1.