If A = {∅}, which of the following is P(A)?
Answer and explanation
Correct answer: {∅, {∅}}
The set A = {∅} has exactly one element: ∅. A one-element set has exactly two subsets: the empty subset ∅ and the complete subset A itself, which is {∅}. Therefore its power set is P(A) = {∅, {∅}}. The braces must be read carefully because ∅ and {∅} are different mathematical objects.
Frequently asked questions
What is the correct answer to this question?
{∅, {∅}}
Why is this the correct answer?
The set A = {∅} has exactly one element: ∅. A one-element set has exactly two subsets: the empty subset ∅ and the complete subset A itself, which is {∅}. Therefore its power set is P(A) = {∅, {∅}}. The braces must be read carefully because ∅ and {∅} are different mathematical objects.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Sets. Topic: Power Set and Subsets.