Vardan thought of a prime three-digit number, all the digits of which are different. What is the last digit, if it is known that the last digit is equal to the sum of the first two digits?

Prime number states that a whole number greater than 1 whose only factors are 1 and itself.

For example; 2, 3, 5, 7, ...

As per the statement: Vardan thought of a prime three-digit number, all the digits of which are different.

Let any three digit prime number Vardan thought is, 437 (all digits 4, 3, and 7 are different).

It is given that: if it is known that the last digit is equal to the sum of the first two digits.

⇒ Sum of first two digit = 4 + 3 = 7 which is equal to the last digit of a 3-digit number 437 i., e 7.

Therefore, the last digit of a prime three-digit number (i. e 437) is, 7