[b]p1.[/b] If $x + z = v$, $w + z = 2v$, $z - w = 2y$, and $y \ne 0$, compute the value of $$\left(x + y +\frac{x}{y} \right)^{101}.$$


[b]p2. [/b]Every minute, a snail picks one cardinal direction (either north, south, east, or west) with equal probability and moves one inch in that direction. What is the probability that after four minutes the snail is more than three inches away from where it started?


[b]p3.[/b] What is the probability that a point chosen randomly from the interior of a cube is closer to the cube’s center than it is to any of the cube’s eight vertices?


[b]p4.[/b] Let $ABCD$ be a rectangle where $AB = 4$ and $BC = 3$. Inscribe circles within triangles $ABC$ and $ACD$. What is the distance between the centers of these two circles?


[b]p5.[/b] $C$ is a circle centered at the origin that is tangent to the line $x - y\sqrt3 = 4$. Find the radius of $C$.


[b]p6.[/b] I have a fair $100$-sided die that has the numbers $ 1$ through $100$ on its sides. What is the probability that if I roll this die three times that the number on the first roll will be greater than or equal to the sum of the two numbers on the second and third rolls?


[b]p7. [/b] List all solutions $(x, y, z)$ of the following system of equations with x, y, and z positive real numbers:
$$x^2 + y^2 = 16$$
$$x^2 + z^2 = 4 + xz$$
$$y^2 + z^2 = 4 + yz\sqrt3$$


[b]p8.[/b] $A_1A_2A_3A_4A_5A_6A_7$ is a regular heptagon ($7$ sided-figure) centered at the origin where $A_1 =
(\sqrt[91]{6}, 0)$. $B_1B_2B_3... B_{13}$ is a regular triskaidecagon ($13$ sided-figure) centered at the origin where $B_1 =(0,\sqrt[91]{41})$. Compute the product of all lengths $A_iB_j$ , where $i$ ranges between $1$ and $7$, inclusive, and $j$ ranges between $1$ and $13$, inclusive.


[b]p9.[/b] How many three-digit integers are there such that one digit of the integer is exactly two times a digit of the integer that is in a different place than the first? (For example, $100$, $122$, and $124$ should be included in the count, but $42$ and $130$ should not.)


[b]p10.[/b] Let $\alpha$ and $\beta$ be the solutions of the quadratic equation $$x^2 - 1154x + 1 = 0.$$ Find $\sqrt[4]{\alpha}+\sqrt[4]{\beta}$.


PS. You should use hide for answers. Collected [url=https://artofproblemsolving.com/community/c5h2760506p24143309]here[/url].
1. First, note that there are \( 100^3 = 1000000 \) possible rolls of the three dice.

2. If the first roll is \( i \), where \( i \in \{1, 2, \ldots, 100\} \), then the sum of the next two rolls must be in the range \([1, i]\). If the sum of the next two rolls is \( j \), where \( j \in \{1, 2, \ldots, i\} \), then there are \( j-1 \) ways to choose the second roll and each of those rolls uniquely determines the third roll.

3. Summing this over for all \( i \) and \( j \) in their respective intervals yields:
\[
\sum_{i=1}^{100} \sum_{j=1}^{i} (j-1)
\]
4. We can simplify the inner sum:
\[
\sum_{j=1}^{i} (j-1) = \sum_{j=0}^{i-1} j = \frac{(i-1)i}{2}
\]
5. Therefore, the double sum becomes:
\[
\sum_{i=1}^{100} \frac{(i-1)i}{2} = \frac{1}{2} \sum_{i=1}^{100} (i^2 - i)
\]
6. We can split the sum into two separate sums:
\[
\frac{1}{2} \left( \sum_{i=1}^{100} i^2 - \sum_{i=1}^{100} i \right)
\]
7. Using the formulas for the sum of the first \( n \) squares and the sum of the first \( n \) integers:
\[
\sum_{i=1}^{n} i^2 = \frac{n(n+1)(2n+1)}{6}, \quad \sum_{i=1}^{n} i = \frac{n(n+1)}{2}
\]
8. Plugging in \( n = 100 \):
\[
\sum_{i=1}^{100} i^2 = \frac{100 \cdot 101 \cdot 201}{6}, \quad \sum_{i=1}^{100} i = \frac{100 \cdot 101}{2}
\]
9. Substituting these into our expression:
\[
\frac{1}{2} \left( \frac{100 \cdot 101 \cdot 201}{6} - \frac{100 \cdot 101}{2} \right)
\]
10. Simplifying the terms:
\[
\frac{1}{2} \left( \frac{100 \cdot 101 \cdot 201}{6} - \frac{100 \cdot 101}{2} \right) = \frac{1}{2} \left( \frac{100 \cdot 101 \cdot 201}{6} - \frac{100 \cdot 101 \cdot 3}{6} \right)
\]
11. Factoring out common terms:
\[
\frac{1}{2} \left( \frac{100 \cdot 101 (201 - 3)}{6} \right) = \frac{1}{2} \left( \frac{100 \cdot 101 \cdot 198}{6} \right)
\]
12. Simplifying further:
\[
\frac{1}{2} \left( \frac{100 \cdot 101 \cdot 198}{6} \right) = \frac{100 \cdot 101 \cdot 198}{12} = \frac{100 \cdot 101 \cdot 33}{2} = 100 \cdot 101 \cdot 16.5 = 166650
\]
13. Therefore, the probability is:
\[
\frac{166650}{1000000} = \frac{3333}{20000}
\]

The final answer is \(\boxed{\frac{3333}{20000}}\)