If Y = {x : x is a natural number and x + 2 = 5}, which element is in Y?
Answer and explanation
Correct answer: 3
To determine membership, solve the defining equation rather than guessing from the options. Starting with x + 2 = 5, subtract 2 from both sides: x = 5 − 2 = 3. Since 3 is a natural number, it satisfies both conditions and belongs to Y. Testing the other choices in the equation gives values different from 5, so option B is the only correct answer.
Frequently asked questions
What is the correct answer to this question?
3
Why is this the correct answer?
To determine membership, solve the defining equation rather than guessing from the options. Starting with x + 2 = 5, subtract 2 from both sides: x = 5 − 2 = 3. Since 3 is a natural number, it satisfies both conditions and belongs to Y. Testing the other choices in the equation gives values different from 5, so option B is the only correct answer.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Common Questions. Topic: General chapter practice.
