
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
<u>Round 1</u>**p1.** If this mathathon has  $7$  rounds of  $3$  problems each, how many problems does it have in total? (Not a trick!)**p2.** Five people, named  $A, B, C, D,$  and  $E$ , are standing in line. If they randomly rearrange themselves, what’s the probability that nobody is more than one spot away from where they started?**p3.** At Barrios’s absurdly priced fish and chip shop, one fish is worth  $\$ 13 $, one chip is worth $ \ $5$ . What is the largest integer dollar amount of money a customer can enter with, and not be able to spend it all on fish and chips?


<u>Round 2</u>**p4.** If there are  $15$  points in  $4$ -dimensional space, what is the maximum number of hyperplanes that these points determine?**p5.** Consider all possible values of  $\frac{z_1 - z_2}{z_2 - z_3} \cdot \frac{z_1 - z_4}{z_2 - z_4}$  for any distinct complex numbers  $z_1$ ,  $z_2$ ,  $z_3$ , and  $z_4$ . How many complex numbers cannot be achieved?**p6.** For each positive integer  $n$ , let  $S(n)$  denote the number of positive integers  $k \le n$  such that  $gcd(k, n) = gcd(k + 1, n) = 1$ . Find  $S(2015)$ .


<u>Round 3</u>**p7.** Let  $P_1$ ,  $P_2$ , $...$ ,  $P_{2015}$  be  $2015$  distinct points in the plane. For any  $i, j \in \{1, 2, ...., 2015\}$ , connect  $P_i$  and  $P_j$  with a line segment if and only if  $gcd(i - j, 2015) = 1$ . Define a clique to be a set of points such that any two points in the clique are connected with a line segment. Let  $\omega$  be the unique positive integer such that there exists a clique with  $\omega$  elements and such that there does not exist a clique with  $\omega + 1$  elements. Find  $\omega$ .**p8.** A Chinese restaurant has many boxes of food. The manager notices that $\bullet$  He can divide the boxes into groups of  $M$  where  $M$  is  $19$ ,  $20$ , or  $21$ . $\bullet$  There are exactly  $3$  integers  $x$  less than  $16$  such that grouping the boxes into groups of  $x$  leaves  $3$  boxes left over.
Find the smallest possible number of boxes of food.**p9.** If  $f(x) = x|x| + 2$ , then compute  $\sum^{1000}_{k=-1000} f^{-1}(f(k) + f(-k) + f^{-1}(k))$ .


<u>Round 4</u>**p10.** Let  $ABC$  be a triangle with  $AB = 13$ ,  $BC = 20$ ,  $CA = 21$ . Let  $ABDE$ ,  $BCFG$ , and  $CAHI$  be squares built on sides  $AB$ ,  $BC$ , and  $CA$ , respectively such that these squares are outside of  $ABC$ . Find the area of  $DEHIFG$ .**p11.** What is the sum of all of the distinct prime factors of  $7783 = 6^5 + 6 + 1$ ?**p12.** Consider polyhedron  $ABCDE$ , where  $ABCD$  is a regular tetrahedron and  $BCDE$  is a regular tetrahedron. An ant starts at point  $A$ . Every time the ant moves, it walks from its current point to an adjacent point. The ant has an equal probability of moving to each adjacent point. After  $6$  moves, what is the probability the ant is back at point  $A$ ?


PS. You should use hide for answers. Rounds 5-7 have been posted [here](https://artofproblemsolving.com/community/c4h2782011p24434676). Collected [here](https://artofproblemsolving.com/community/c5h2760506p24143309).

Present the answer in LaTex format: \boxed{Your answer}
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