If B={x: x is a two-digit natural number and its units digit is 5}, which is the correct beginning of its roster form?
Answer and explanation
Correct answer: B={15,25,35,45,...,95}
Two-digit natural numbers run from 10 through 99. Selecting those whose units digit is 5 gives 15,25,35,45,55,65,75,85,95, each formed by increasing the tens digit while keeping the units digit fixed. The number 5 is not two-digit, multiples of 10 end in 0, and 50–59 do not all end in 5. Thus option A is correct.
Frequently asked questions
What is the correct answer to this question?
B={15,25,35,45,...,95}
Why is this the correct answer?
Two-digit natural numbers run from 10 through 99. Selecting those whose units digit is 5 gives 15,25,35,45,55,65,75,85,95, each formed by increasing the tens digit while keeping the units digit fixed. The number 5 is not two-digit, multiples of 10 end in 0, and 50–59 do not all end in 5. Thus option A is correct.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Common Questions.
Student feedback
Was this question useful?
👍 0 Helpful 👎 0 Not helpful
Yes 0% No 0%
0 responsesStudent Reviews
No published reviews yet.
