Question

The squares of which of the following would be odd numbers:
$431$
$2826$
$7779$
$82004$

• A. $431$ and $7779$
• B. $431$ and $2826$
• C. $2826$ and $7779$
• D. $2826$ and $82004$

Answer 1

The correct option is A $431$ and $7779$

The squares of $431$ and $7779$ would be odd numbers as both the numbers are odd.
$\Rightarrow$ Because the squares of odd numbers are always odd and the squares of even numbers are always even