Which option correctly represents A = {x : x is a one-digit natural number}?
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Answer and explanation
Correct answer: A = {1, 2, 3, 4, 5, 6, 7, 8, 9}
In the usual school convention, natural numbers begin with 1. The one-digit natural numbers are therefore 1 through 9. Zero is not included under this convention, and 10 is a two-digit number. Hence the correct roster form is {1, 2, 3, 4, 5, 6, 7, 8, 9}, shown in option B.
Frequently asked questions
What is the correct answer to this question?
A = {1, 2, 3, 4, 5, 6, 7, 8, 9}
Why is this the correct answer?
In the usual school convention, natural numbers begin with 1. The one-digit natural numbers are therefore 1 through 9. Zero is not included under this convention, and 10 is a two-digit number. Hence the correct roster form is {1, 2, 3, 4, 5, 6, 7, 8, 9}, shown in option B.
Which subject and chapter does this question cover?
This is a Class 10 Mathematics question. Chapter: Sets. Topic: The Empty Set, Finite and Infinite Sets, Equal Sets.
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