[b]p1. [/b] If $f(x) = 3x - 1$, what is $f^6(2) = (f  \circ  f  \circ  f  \circ  f  \circ  f  \circ f)(2)$?


[b]p2.[/b] A frog starts at the origin of the $(x, y)$ plane and wants to go to $(6, 6)$. It can either jump to the right one unit or jump up one unit. How many ways are there for the frog to jump from the origin to $(6, 6)$ without passing through point $(2, 3)$?


[b]p3.[/b] Alfred, Bob, and Carl plan to meet at a café between noon and $2$ pm. Alfred and Bob will arrive at a random time between noon and $2$ pm. They will wait for $20$ minutes or until $2$ pm for all $3$ people to show up after which they will leave. Carl will arrive at the café at noon and leave at $1:30$ pm. What is the probability that all three will meet together?


[b]p4.[/b] Let triangle $ABC$ be isosceles with $AB = AC$. Let $BD$ be the altitude from $ B$ to $AC$, $E$ be the midpoint of $AB$, and $AF$ be the altitude from $ A$ to $BC$. If $AF = 8$ and the area of triangle $ACE$ is $ 8$, find the length of $CD$.


[b]p5.[/b] Find the sum of the unique prime factors of $(2018^2 - 121) \cdot (2018^2 - 9)$.


[b]p6.[/b] Compute the remainder when $3^{102} + 3^{101} + ... + 3^0$ is divided by $101$.


[b]p7.[/b] Take regular heptagon $DUKMATH$ with side length $ 3$. Find the value of $$\frac{1}{DK}+\frac{1}{DM}.$$



[b]p8.[/b] RJ’s favorite number is a positive integer less than $1000$. It has final digit of $3$ when written in base $5$ and final digit $4$ when written in base $6$. How many guesses do you need to be certain that you can guess RJ’s favorite number?


[b]p9.[/b] Let $f(a, b) = \frac{a^2+b^2}{ab-1}$ , where $a$ and $b$ are positive integers, $ab \ne 1$. Let $x$ be the maximum positive integer value of $f$, and let $y$ be the minimum positive integer value of f. What is $x - y$ ?


[b]p10.[/b] Haoyang has a circular cylinder container with height $50$ and radius $5$ that contains $5$ tennis balls, each with outer-radius $5$ and thickness $1$. Since Haoyang is very smart, he figures out that he can fit in more balls if he cuts each of the balls in half, then puts them in the container, so he is ”stacking” the halves. How many balls would he have to cut up to fill up the container?


PS. You should use hide for answers. Collected [url=https://artofproblemsolving.com/community/c5h2760506p24143309]here[/url].
### Problem 1
1. Given the function \( f(x) = 3x - 1 \), we need to find \( f^6(2) \).
2. Calculate \( f(2) \):
   \[
   f(2) = 3 \cdot 2 - 1 = 5
   \]
3. Calculate \( f(f(2)) = f(5) \):
   \[
   f(5) = 3 \cdot 5 - 1 = 14
   \]
4. Calculate \( f(f(f(2))) = f(14) \):
   \[
   f(14) = 3 \cdot 14 - 1 = 41
   \]
5. Calculate \( f(f(f(f(2)))) = f(41) \):
   \[
   f(41) = 3 \cdot 41 - 1 = 122
   \]
6. Calculate \( f(f(f(f(f(2))))) = f(122) \):
   \[
   f(122) = 3 \cdot 122 - 1 = 365
   \]
7. Calculate \( f(f(f(f(f(f(2)))))) = f(365) \):
   \[
   f(365) = 3 \cdot 365 - 1 = 1094
   \]

The final answer is \(\boxed{33}\)