[b]p1.[/b] Roll two dice. What is the probability that the sum of the rolls is prime?


[b]p2. [/b]Compute the sum of the first $20$ squares.


[b]p3.[/b] How many integers between $0$ and $999$ are not divisible by $7, 11$, or $13$?


[b]p4.[/b] Compute the number of ways to make $50$ cents using only pennies, nickels, dimes, and quarters.


[b]p5.[/b] A rectangular prism has side lengths $1, 1$, and $2$. What is the product of the lengths of all of the diagonals?

[b]p6.[/b] What is the last digit of $7^{6^{5^{4^{3^{2^1}}}}}$ ?


[b]p7.[/b] Given square $ABCD$ with side length $3$, we construct two regular hexagons on sides $AB$ and $CD$ such that the hexagons contain the square. What is the area of the intersection of the two hexagons?
[img]https://cdn.artofproblemsolving.com/attachments/f/c/b2b010cdd0a270bc10c6e3bb3f450ba20a03e7.png[/img]


[b]p8.[/b] Brooke is driving a car at a steady speed. When she passes a stopped police officer, she begins decelerating at a rate of $10$ miles per hour per minute until she reaches the speed limit of $25$ miles per hour. However, when Brooke passed the police officer, he immediately began accelerating at a rate of $20$ miles per hour per minute until he reaches the rate of $40$ miles per hour. If the police officer catches up to Brooke after 3 minutes, how fast was Brooke driving initially?


[b]p9.[/b] Find the ordered pair of positive integers $(x, y)$ such that $144x - 89y = 1$ and $x$ is minimal.


[b]p10.[/b] How many zeroes does the product of the positive factors of $10000$ (including $1$ and $10000$) have?


[b]p11.[/b] There is a square configuration of desks. It is known that one can rearrange these desks such that it has $7$ fewer rows but $10$ more columns, with $13$ desks remaining. How many desks are there in the square configuration?


[b]p12.[/b] Given that there are $168$ primes with $3$ digits or less, how many numbers between $1$ and $1000$ inclusive have a prime number of factors?


[b]p13.[/b] In the diagram below, we can place the integers from $1$ to $19$ exactly once such that the sum of the entries in each row, in any direction and of any size, is the same. This is called the magic sum. It is known that such a configuration exists. Compute the magic sum.
[img]https://cdn.artofproblemsolving.com/attachments/3/4/7efaa5ba5ad250e24e5ad7ef03addbf76bcfb4.png[/img]


[b]p14.[/b] Let $E$ be a random point inside rectangle $ABCD$ with side lengths $AB = 2$ and $BC = 1$. What is the probability that angles $ABE$ and $CDE$ are both obtuse?


[b]p15.[/b] Draw all of the diagonals of a regular $13$-gon. Given that no three diagonals meet at points other than the vertices of the $13$-gon, how many intersection points lie strictly inside the $13$-gon?


[b]p16.[/b] A box of pencils costs the same as $11$ erasers and $7$ pencils. A box of erasers costs the same as $6$ erasers and a pencil. A box of empty boxes and an eraser costs the same as a pencil. Given that boxes cost a penny and each of the boxes contain an equal number of objects, how much does it costs to buy a box of pencils and a box of erasers combined?


[b]p17.[/b] In the following figure, all angles are right angles and all sides have length $1$. Determine the area of the region in the same plane that is at most a distance of $1/2$ away from the perimeter of the figure.
[img]https://cdn.artofproblemsolving.com/attachments/6/2/f53ae3b802618703f04f41546e3990a7d0640e.png[/img]


[b]p18.[/b] Given that $468751 = 5^8 + 5^7 + 1$ is a product of two primes, find both of them.


[b]p19.[/b] Your wardrobe contains two red socks, two green socks, two blue socks, and two yellow socks. It is currently dark right now, but you decide to pair up the socks randomly. What is the probability that none of the pairs are of the same color?


[b]p20.[/b] Consider a cylinder with height $20$ and radius $14$. Inside the cylinder, we construct two right cones also with height $20$ and radius $14$, such that the two cones share the two bases of the cylinder respectively. What is the volume ratio of the intersection of the two cones and the union of the two cones?


PS. You had better use hide for answers. Collected [url=https://artofproblemsolving.com/community/c5h2760506p24143309]here[/url].
To solve the problem of finding how many integers between $0$ and $999$ are not divisible by $7$, $11$, or $13$, we will use the principle of inclusion-exclusion.

1. **Define the sets:**
   Let $A_7$, $A_{11}$, and $A_{13}$ represent the sets of integers between $0$ and $999$ that are divisible by $7$, $11$, and $13$, respectively.

2. **Calculate the sizes of these sets:**
   \[
   |A_7| = \left\lfloor \frac{999}{7} \right\rfloor = 142
   \]
   \[
   |A_{11}| = \left\lfloor \frac{999}{11} \right\rfloor = 90
   \]
   \[
   |A_{13}| = \left\lfloor \frac{999}{13} \right\rfloor = 76
   \]

3. **Calculate the sizes of the intersections of these sets:**
   \[
   |A_7 \cap A_{11}| = \left\lfloor \frac{999}{77} \right\rfloor = 12 \quad \text{(since } 77 = 7 \times 11\text{)}
   \]
   \[
   |A_7 \cap A_{13}| = \left\lfloor \frac{999}{91} \right\rfloor = 10 \quad \text{(since } 91 = 7 \times 13\text{)}
   \]
   \[
   |A_{11} \cap A_{13}| = \left\lfloor \frac{999}{143} \right\rfloor = 6 \quad \text{(since } 143 = 11 \times 13\text{)}
   \]

4. **Calculate the size of the intersection of all three sets:**
   \[
   |A_7 \cap A_{11} \cap A_{13}| = \left\lfloor \frac{999}{1001} \right\rfloor = 0 \quad \text{(since } 1001 = 7 \times 11 \times 13\text{)}
   \]

5. **Apply the principle of inclusion-exclusion:**
   \[
   |A_7 \cup A_{11} \cup A_{13}| = |A_7| + |A_{11}| + |A_{13}| - |A_7 \cap A_{11}| - |A_7 \cap A_{13}| - |A_{11} \cap A_{13}| + |A_7 \cap A_{11} \cap A_{13}|
   \]
   \[
   = 142 + 90 + 76 - 12 - 10 - 6 + 0 = 280
   \]

6. **Calculate the number of integers not divisible by $7$, $11$, or $13$:**
   There are $999$ integers from $0$ to $999$ inclusive. Therefore, the number of integers not divisible by $7$, $11$, or $13$ is:
   \[
   999 - 280 = 719
   \]

The final answer is $\boxed{719}$.