Saved Bookmarks
| 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. |
|