Question

Find a two-digit prime number such that the number obtained by reversing by their digits are also prime.

Answer 1

As we know that prime numbers are the numbers having only two factors $1$ and itself. Ex - : $2,3,5,7.........$

Since two-digit prime number are $11,13,17,$ and $19.$ By reversing their digits we will get $11,31,71$and $91.$$11,13$and $17$ are prime number except $91.$

Hence two-digit prime number $11,13$and $17$ such that the number obtained by reversing by their digits are also prime.