Question

If B = {1, 3, 5, 7, 9}, then set-builder representation of B is___________.

• A. B = {x: x is a prime number less than 10}
• B. B = {x: x is an odd number less than 10}
• C. B = {x: x is an odd natural number}
• D. B = {x: x is an odd natural number less than 10}

Answer 1

The correct option is D

B = {x: x is an odd natural number less than 10}

The set of odd numbers less than 10 gives {-∞,- - - - -, -5, -3, -1, 1, 3, 5, 7, 9}

Set B has 1, which is not a prime number and has only odd natural numbers.

B is a set of all odd natural numbers less than 10.