
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.** A circle is inscribed inside a square such that the cube of the radius of the circle is numerically equal to the perimeter of the square. What is the area of the circle?**p2.** If the coefficient of  $z^ky^k$  is  $252$  in the expression  $(z + y)^{2k}$ , find  $k$ .**p3.** Let  $f(x) = \frac{4x^4-2x^3-x^2-3x-2}{x^4-x^3+x^2-x-1}$  be a function defined on the real numbers where the denominator is not zero. The graph of  $f$  has a horizontal asymptote. Compute the sum of the x-coordinates of the points where the graph of  $f$  intersects this horizontal asymptote. If the graph of f does not intersect the asymptote, write  $0$ .


<u>Round 2</u>**p4.** How many  $5$ -digit numbers have strictly increasing digits? For example,  $23789$  has strictly increasing digits, but  $23889$  and  $23869$  do not.**p5.** Let  $$ y =\frac{1}{1 +\frac{1}{9 +\frac{1}{5 +\frac{1}{9 +\frac{1}{5 +...}}}}} $$   If  $y$  can be represented as  $\frac{a\sqrt{b} + c}{d}$  , where  $b$  is not divisible by any squares, and the greatest common divisor of  $a$  and  $d$  is  $1$ , find the sum  $a + b + c + d$ .**p6.** “Counting” is defined as listing positive integers, each one greater than the previous, up to (and including) an integer  $n$ . In terms of  $n$ , write the number of ways to count to  $n$ .


<u>Round 3</u>**p7.** Suppose  $p$ ,  $q$ ,  $2p^2 + q^2$ , and  $p^2 + q^2$  are all prime numbers. Find the sum of all possible values of  $p$ .**p8.** Let  $r(d)$  be a function that reverses the digits of the  $2$ -digit integer  $d$ . What is the smallest  $2$ -digit positive integer  $N$  such that for some  $2$ -digit positive integer  $n$  and  $2$ -digit positive integer  $r(n)$ ,  $N$  is divisible by  $n$  and  $r(n)$ , but not by  $11$ ?**p9.** What is the period of the function  $y = (\sin(3\theta) + 6)^2 - 10(sin(3\theta) + 7) + 13$ ?


<u>Round 4</u>**p10.** Three numbers  $a, b, c$  are given by  $a = 2^2 (\sum_{i=0}^2 2^i)$ ,  $b = 2^4(\sum_{i=0}^4  2^i)$ , and  $c  = 2^6(\sum_{i=0}^6  2^i)$  .  $u, v, w$  are the sum of the divisors of a, b, c respectively, yet excluding the original number itself. What is the value of  $a + b + c -u - v - w$ ?**p11.** Compute  $\sqrt{6- \sqrt{11}} - \sqrt{6+ \sqrt{11}}$ .**p12.** Let  $a_0, a_1,..., a_n$  be such that  $a_n\ne 0$  and   $$ (1 + x + x^3)^{341}(1 + 2x + x^2 + 2x^3 + 2x^4 + x^6)^{342} =\sum_{i=0}^n a_ix^i. $$   Find the number of odd numbers in the sequence  $a_0, a_1,..., a_n$ .



PS. You should use hide for answers. Rounds 5-7 have been posted [here](https://artofproblemsolving.com/community/c4h2781343p24424617). Collected [here](https://artofproblemsolving.com/community/c5h2760506p24143309).

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