Art of Problem Solving
AoPS Online
Math texts, online classes, and more
for students in grades 5-12.
Visit AoPS Online ‚
Books for Grades 5-12 Online Courses
Beast Academy
Engaging math books and online learning
for students ages 6-13.
Visit Beast Academy ‚
Books for Ages 6-13 Beast Academy Online
AoPS Academy
Small live classes for advanced math
and language arts learners in grades 2-12.
Visit AoPS Academy ‚
Find a Physical Campus Visit the Virtual Campus

Difference between revisions of "2005 AIME II Problems"
(→‎Problem 2)
Line 5: Line 5:
  
 
== Problem 2 ==
 
== Problem 2 ==
−
For each positive integer ''k'', let <math>S_k</math> denote the increasing arithmetic sequence of integers whose first term is 1 and whose common difference is ''k''. For example, <math>S_3</math> is the squence <math>1,4,7,10 ...</math>. For how many values of ''k'' does <math>S_k</math> contain the term 2005?
+
A hotel packed breakfast for each of three guests. Each breakfast should have consisted of three types of rolls, one each of nut, cheese, and fruit rolls. The preparer wrapped each of the nine rolls and once wrapped, the rolls were indistinguishable from one another. She then randomly put three rolls in a bag for each of the guests. Given that the probability each guest got one roll of each type is <math> \frac mn, </math> where <math> m </math> and <math> n </math> are relatively prime integers, find <math> m+n. </math>
  
 
[[2005 AIME II Problems/Problem 2|Solution]]
 
[[2005 AIME II Problems/Problem 2|Solution]]
 +
 
== Problem 3 ==
 
== Problem 3 ==
 
How many positive integers have exactly three proper divisors, each of which is less than 50?  
 
How many positive integers have exactly three proper divisors, each of which is less than 50?  

Revision as of 22:17, 8 July 2006

Problem 1

A game uses a deck of $n$ different cards, where $n$ is an integer and $n \geq 6.$ The number of possible sets of 6 cards that can be drawn from the deck is 6 times the number of possible sets of 3 cards that can be drawn. Find $n.$

Solution

Problem 2

A hotel packed breakfast for each of three guests. Each breakfast should have consisted of three types of rolls, one each of nut, cheese, and fruit rolls. The preparer wrapped each of the nine rolls and once wrapped, the rolls were indistinguishable from one another. She then randomly put three rolls in a bag for each of the guests. Given that the probability each guest got one roll of each type is $\frac mn,$ where $m$ and $n$ are relatively prime integers, find $m+n.$

Solution

Problem 3

How many positive integers have exactly three proper divisors, each of which is less than 50?

Solution

Problem 4

The director of a marching band wishes to place the members into a formation that includes all of them and has no unfilled positions. If they are arranged in a square formation, there are 5 members left over. The director realizes that if he arranges the group in a formation with 7 more rows than columns, there are no members left over. Find the maximum number of members this band can have.

Solution

Problem 5

Robert has 4 indistinguishable gold coins and 4 indistinguishable silver coins. Each coin has an engraving of one face on one side, but not on the other. He wants to stack the eight coins on a table into a single stack so that no two adjacent coins are face to face. Find the number of possible distunguishable arrangements of the 8 coins.

Solution

Problem 6

Let $P$ be the product of nonreal roots of $x^4-4x^3+6x^2-4x=2005$. Find $\lfloor P \rfloor$

Solution

Problem 7

In quadrilateral $ABCD$, $BC=8$, $CD=12$, $AD=10$ and $m\angle A=m\angle B=60\circ$. Given that $AB=p+\sqrt{q}$, where p and q are positive integers, find $p+q$.

Solution

Problem 8

The equation $2^{333x-2}+2^{111x+2}=2^{222x+1}+1$ has three real roots. Given that their sum is $\frac{m}{n}$ where $m$ and $n$ are relatively prime positive integers, find $m+n$.

Solution

Problem 9

Twenty seven unit cubes are painted orange on a set of four faces so that two non-painted faces share an edge. The $27$ cubes are randomly arranged to form a $3\times 3\times 3$ cube. Given the probability of the entire surface area of the larger cube is orange is $\frac{p^a}{q^b r^c}$ where $p,q,$ and $r$ are distinct primes and $a,b,$ and $c$ are positive integers, find $a+b+c+p+q+r$.

Solution

Problem 10

Triangle $ABC$ lies in the Cartesian Plane and has an area of 70. The coordinates of $B$ and $C$ are $(12,19)$ and $(23,20),$ respectively, and the coordinates of $A$ are $(p,q).$ The line containing the median to side $BC$ has slope $-5$. Find the largest possible value of $p+q$.

Solution

Problem 11

A semicircle with diameter $d$ is contained in a square whose sides have length 8. Given the maximum value of $d$ is $m-\sqrt{n}$, find $m+n$.

Retrieved from "https://artofproblemsolving.com/wiki/index.php?title=2005_AIME_II_Problems&oldid=6435"