Two friends, Suri and Anitha, decided to play the game pockets billiard on their holiday. This game is similar to the carom game, except but it has \(6\) holes on the board to strike the balls into it. This game consists of \(15\) numbered color balls, and \(1\) cue ball, which is used to strike the other \(15\) numbered color balls to the holes. These balls are arranged in the pyramid form. The first player strikes them using the white ball(cue ball) to break the formation and then tries to sink the ball into the holes. Each player takes alternate turns to strike the balls.
(Note: Ignore the cue ball while taking the total number of balls.)
1. If Suri plays first, then the probability that she successfully sinks the ball numbered 3 is
2. If Anitha plays secondly without replacing the ball 3, then the probability that Anitha sink the ball numbered 12 is
3. The probability that Suri sinks a ball is a prime number is
4. The probability that Anitha sinks a ball is a number divisible by \(3\) is