If A={1,3,5,7}, what type of numbers are all the elements of A?
Answer and explanation
Correct answer: Odd natural numbers
The governing idea is identifying a common property shared by every element. The numbers 1, 3, 5, and 7 are natural numbers, and none is divisible by 2, so all are odd natural numbers. They are not even, and not all are perfect squares. Although 3, 5, and 7 are prime, 1 is not prime, so option D cannot describe the whole set. Therefore option A is correct.
Frequently asked questions
What is the correct answer to this question?
Odd natural numbers
Why is this the correct answer?
The governing idea is identifying a common property shared by every element. The numbers 1, 3, 5, and 7 are natural numbers, and none is divisible by 2, so all are odd natural numbers. They are not even, and not all are perfect squares. Although 3, 5, and 7 are prime, 1 is not prime, so option D cannot describe the whole set. Therefore option A is correct.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
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