Question

Activity=ask all the students in your class to write a three digit number. choose any student from the room at random.what is the probability that the no. written by her/him is divisible by 3,if the sum of itsdigit is divisible by 3.

Answer 1

Any no whose sum of digits is divisible by 3 ,the no is also divisible by 3.
So, Probability=1.