
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
Indonesia Regional <details><summary>MO</summary>also know as provincial level, is a qualifying round for National Math Olympiad</details>  
Year 2008  <details><summary>Part A</summary>Part B consists of 5 essay / proof problems, posted [here](https://artofproblemsolving.com/community/c4h2684687p23289130)</details>

Time: 90 minutes <details><summary>Rules</summary>$\bullet$  Write only the answers to the questions given.  $\bullet$  Some questions can have more than one correct answer. You are asked to provide the most correct or exact answer to a question like this. Scores will only be given to the giver of the most correct or most exact answer. $\bullet$  Each question is worth 1 (one) point.</details>


p1. The number of positive divisors from  $2008$  is ...

p2. How many ways are there to arrange letters of word MATEMATIKA with the two T's not adjacent? ...

p3. If  $0 < b < a$  and  $a^2 + b^2 = 6ab$ , then  $\frac{a+b}{a-b}= ...$ p4. Two of the altitudes of triangle  $ABC$  are acute, equal to  $4$  and  $ 12$ , respectively. If the length of the third altitude of the triangle is an integer, then the maximum length of the height of the triangle is ...

p5. In the  $XOY$  plane, the number of lines that intersect the  $X$  axis at the point with the abscissa of prime numbers and intersect the  $Y$  axis at the point with positive integer ordinates and through the point  $(4, 3)$  is ...

p6. Given a triangle  $ABC$ ,  $AD$  is perpendicular to  $BC$  such that  $DC = 2$  and  $BD = 3$ . If  $\angle BAC = 45^o$ , then the area of ​​triangle  $ABC$  is ...

p7. If  $x$  and  $y$  are integers that satisfy  $y^2 + 3x^2y^2 = 30x^2 + 517$ , then  $3x^2y^2 = ...$ p8. Given a triangle  $ABC$ , where  $BC = a$ ,  $AC = b$  and  $\angle C = 60^o$ . If  $\frac{a}{b}=2+\sqrt3$ , then the measure of angle  $B$  is ...

p9. One hundred students from a province in Java took part in the selection at the provincial level and the average score was  $100$ . The number of grade II students who took part in the selection was  $50\%$  more than grade III students, and the average score of grade III students was  $50\%$  higher of the average score of class II students. The average score of class III students is ...

p10. Given triangle  $ABC$ , where  $BC = 5$ ,  $AC = 12$ , and  $AB = 13$ . Points  $D$  and  $E$  on  $AB$  and  $AC$  respectivrly are such that  $DE$  divides triangle  $ABC$  into two equal parts. The minimum length of  $DE$  is ...

p11. Let  $a, b, c$  and  $d$  be rational numbers. If it is known that the equation  $x^4 + ax^3 + bx^2 + cx + d = 0$  has  $4$  real roots, two of which are  $\sqrt2$  and  $\sqrt{2008}$ . The value of  $a + b + c + d$  is ...

p12. Given a triangle  $ABC$  with sides  $a, b$ , and  $c$ . The value of  $a^2 + b^2 + c^2$  is equal to  $16$  times the area of ​​triangle  $ABC$ . The value of  $\cot A + \cot B + \cot C$  is ...

p13. Given  $f(x) = x^2 + 4$ . Let  $x$  and  $y$  be positive real numbers that satisfy  $f(xy) + f(y-x) = f(y+x)$ . The minimum value of  $x + y$  is ...

p14. The number of positive integers  $n$  less than  $2008$  that has exactly  $\frac{n}{2}$  numbers less than  $n$  and is prime relative to  $n$  is ...

p15. A polynomial  $f(x)$  satisfies the equation  $f(x^2)-x^3f(x) = 2(x^3-1)$  for every  $x$  real number. The degree (highest power of   $x$ ) of  $f(x)$  is ..

p16. Assume one year  $365$  days. The probability that out of  $20$  people chosen at random, two people have a birthday on the same day is ...

p17. Three numbers are chosen at random from  $\{1,2,3,...,2008\}$ . The probability that the sum of all three is even is ...

p18. Let  $|X|$  represent the number of members of the set  $X$ . If  $|A\cup B| = 10$  and  $|A| = 4$ , then the possible values ​​for  $ B$  are ...

p19. It is known that  $AD$  is the altitude of triangle  $ABC$ ,  $\angle DAB = \angle ACD$ ,  $AD = 6$ ,  $BD = 8$ . The area of ​​triangle  $ABC$  is ...

p20. Find the value of  $\sum_{k=0}^{1004} 3^k {{1004} \choose k}$ .

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