Question

$(11111111{)}^2$ equals:

• A. 123456787654321
• B. 123454321
• C. 1234567654321
• D. 12321

Answer 1

The correct option is A

123456787654321

The square of numbers containing only '1' follow a specific pattern.

Since it contains eight 1's, the number will first increase from 1 to 8 and then decrease to 1.

∴ $(11111111{)}^2$ = 123456787654321