1.

Let ab, a ≠ b, is a 2-digit prime number such that ba is also a prime number. The sum of all such numbers is:1. 3742. 4183. 3964. 407

Answer» Correct Answer - Option 2 : 418

Given :

ab is a 2-digit prime number

a ≠ b

To find :

The sum of ab and ba

Solution :

List of such prime numbers is

13, , 31, 17, 71, 37, 73, 79, 97.

⇒ Sum of these numbers = 13 + 31 + 17 + 71 + 37 + 73 + 79 + 97

⇒ Sum of these numbers = 418

∴ The required number is 418.



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