Question

How to write {1,5,15,25} in set builder form?

Answer 1

{x: either x=1 or x=5n, where n is an odd natural number}

Answer 2

Write set {1, 5, 15, 25,…} in set-builder form. Explanation: Set should include 1 or an odd multiple of 5. 4. Express {x: x= n/ (n+1), n is a natural number less than 7} in roster form.

hope this helps you dear :)