Question

Write the set of first five positive integers whose square is odd?

Answer 1

The set of the first five positive integers whose squares are odd numbers is {1,3,5,7,9}.

We can verify this as follows:
1² = 1, which is odd an odd number

3² = 9, which is odd an odd number

5² = 25, which is odd an odd number

7² = 49, which is odd an odd number

9² = 81, which is an odd number

Therefore, the set of the first five integers whose squares are odd numbers is {1,3,5,7,9}.