Answer:
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
