What is the correct roster form of O={x: x is a digit and x is odd}?
Answer and explanation
Correct answer: O={1,3,5,7,9}
The governing concept is classification of digits followed by roster notation. Decimal digits are 0 through 9. An odd digit is not divisible by 2, so the odd digits are 1, 3, 5, 7, and 9. Hence O={1,3,5,7,9}, making option A correct. Option B lists even digits, C mixes odd and even digits, and D wrongly includes 11, which is not a single digit.
Frequently asked questions
What is the correct answer to this question?
O={1,3,5,7,9}
Why is this the correct answer?
The governing concept is classification of digits followed by roster notation. Decimal digits are 0 through 9. An odd digit is not divisible by 2, so the odd digits are 1, 3, 5, 7, and 9. Hence O={1,3,5,7,9}, making option A correct. Option B lists even digits, C mixes odd and even digits, and D wrongly includes 11, which is not a single digit.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Number Systems.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
