Question

A prime number N in the range of $10$ to $50$ remains unchanged when its digits are reversed. What is the square of this number?

• A. $196$
• B. $961$
• C. $169$
• D. $121$

Answer 1

Answer: (D)

$121$

The prime numbers between $10$ and $50$ are $11,13,17,19,23,29,31,37,41,43$, and $47$ The number $11$ remains unchanged when its digits are reversed So wquare of $11=11\times 11=121$