p1. The pattern $ABCCCDDDDABBCCCDDDDABBCCCDDDD...$ repeats to infinity. Which letter ranks in place $2533$ ?


p2. Prove that if $a > 2$ and $b > 3$ then $ab + 6 > 3a + 2b$.


p3. Given a rectangle $ABCD$ with size $16$ cm $\times 25$ cm, $EBFG$ is kite, and the length of $AE = 5$ cm. Determine the length of $EF$.
[img]https://cdn.artofproblemsolving.com/attachments/2/e/885af838bcf1392eb02e2764f31ae83cb84b78.png[/img]

p4. Consider the following series of statements.
It is known that $x = 1$.
Since $x = 1$ then $x^2 = 1$.
So $x^2 = x$.
As a result, $x^2 - 1 = x- 1$
$(x -1) (x + 1) = (x - 1) \cdot  1$
Using the rule out, we get $x + 1 = 1$
$1 + 1 = 1$
$2 = 1$
The question.
a. If $2 = 1$, then every natural number must be equal to $ 1$. Prove it.
b. The result of $2 = 1$ is something that is impossible. Of course there's something wrong
in the argument above? Where is the fault? Why is that you think wrong?


p5. To calculate $\sqrt{(1998)(1996)(1994)(1992)+16}$ .
someone does it in a simple way as follows: $2000^2-2 \times 5\times 2000 + 5^2 - 5$? 
Is the way that person can justified? Why?


p6. To attract customers, a fast food restaurant give gift coupons to everyone who buys food at the restaurant with a value of more than $25,000$  Rp.. Behind every coupon is written one of the following numbers: $9$, $12$, $42$, $57$, $69$, $21$, 15, $75$, $24$ and $81$. Successful shoppers collect coupons with the sum of the numbers behind the coupon is equal to 100 will be rewarded in the form of TV $21''$. If the restaurant owner provides as much as $10$ $21''$ TV pieces, how many should be handed over to the the customer?


p7. Given is the shape of the image below.
[img]https://cdn.artofproblemsolving.com/attachments/4/6/5511d3fb67c039ca83f7987a0c90c652b94107.png[/img]
The centers of circles $B$, $C$, $D$, and $E$ are placed on the diameter of circle  $A$ and the diameter of circle $B$ is the same as the radius of circle $A$. Circles $C$, $D$, and $E$ are equal and the pairs are tangent externally such that the sum of the lengths of the diameters of the three circles is the same with the radius of the circle $A$. What is the ratio of the circumference of the circle $A$ with the sum of the circumferences of circles $B$, $C$, $D$, and $E$?


p8. It is known that $a + b + c = 0$. Prove that $a^3 + b^3 + c^3 = 3abc$.
### Problem 1:
1. The pattern "ABCCCDDDD" repeats every 10 characters.
2. To find the letter at position 2533, we need to determine the position within one cycle of 10 characters.
3. Calculate the remainder of 2533 divided by 10:
   \[
   2533 \mod 10 = 3
   \]
4. The remainder is 3, which corresponds to the 3rd character in the pattern "ABCCCDDDD".

The final answer is \(\boxed{\text{None}}\).