In a long line of people arranged left to right, the $1013^{\text {th }}$ person from the left is also the $1010^{\text {th }}$ person from the right. How many people are in the line?
What is $10!-7!\cdot 6!$ ?
For how many integer values of $x$ is $|2 x| \leq 7 \pi$ ?
Balls numbered $1,2,3, \ldots$ are deposited in 5 bins, labeled $A, B, C, D$, and $E$, using the following procedure. Ball 1 is deposited in bin $A$, and balls 2 and 3 are deposited in bin $B$. The next 3 balls are deposited in bin $C$, the next 4 in bin $D$, and so on, cycling back to bin $A$ after balls are deposited in bin $E$. (For example, balls numbered $22,23, \ldots, 28$ are deposited in bin $B$ at step 7 of this process.) In which bin is ball 2024 deposited?
In the following expression, Melanie changed some of the plus signs to minus signs: $$ 1+3+5+7+\cdots+97+99 $$ When the new expression was evaluated, it was negative. What is the least number of plus signs that Melanie could have changed to minus signs?
A rectangle has integer length sides and an area of 2024 . What is the least possible perimeter of the rectangle?
What is the remainder when $7^{2024}+7^{2025}+7^{2026}$ is divided by 19 ?
Let $N$ be the product of all the positive integer divisors of 42 . What is the units digit of $N$ ?
Real numbers $a, b$, and $c$ have arithmetic mean 0 . The arithmetic mean of $a^{2}, b^{2}$, and $c^{2}$ is 10 . What is the arithmetic mean of $a b, a c$, and $b c$ ?
Quadrilateral $A B C D$ is a parallelogram, and $E$ is the midpoint of the side $\overline{A D}$. Let $F$ be the intersection of lines $E B$ and $A C$. What is the ratio of the area of quadrilateral $C D E F$ to the area of triangle $C F B$ ?
In the figure below, $W X Y Z$ is a rectangle with $W X=4$ and $W Z=8$. Point $M$ lies on $\overline{X Y}$, point $A$ lies on $\overline{Y Z}$, and $\angle W M A$ is a right angle. The areas of triangles $\triangle W X M$ and $\triangle W A Z$ are equal. What is the area of $\triangle W M A$ ?
A group of 100 students from different countries meet at a mathematics competition. Each student speaks the same number of languages, and, for every pair of students $A$ and $B$, student $A$ speaks some language that student $B$ does not speak, and student $B$ speaks some language that student $A$ does not speak. What is the least possible total number of languages spoken by all the students?
Positive integers $x$ and $y$ satisfy the equation $\sqrt{x}+\sqrt{y}=\sqrt{1183}$. What is the minimum possible value of $x+y$ ?
A dartboard is the region $B$ in the coordinate plane consisting of points ( $x, y$ ) such that $|x|+|y| \leq 8$. A target $T$ is the region where $\left(x^{2}+y^{2}-25\right)^{2} \leq 49$. A dart is thrown and lands at a random point in $B$. The probability that the dart lands in $T$ can be expressed as $\frac{m}{n} \cdot \pi$, where $m$ and $n$ are relatively prime positive integers. What is $m+n$ ?
A list of 9 real numbers consists of $1,2.2,3.2,5.2,6.2$, and 7 , as well as $x, y$, and $z$ with $x \leq y \leq z$. The range of the list is 7 , and the mean and the median are both positive integers. How many ordered triples $(x, y, z)$ are possible?
Jerry likes to play with numbers. One day, he wrote all the integers from 1 to 2024 on the whiteboard. Then he repeatedly chose four numbers on the whiteboard, erased them, and replaced them by either their sum or their product. (For example, Jerry's first step might have been to erase $1,2,3$, and 5 , and then write either 11 , their sum, or 30 , their product, on the whiteboard.) After repeatedly performing this operation, Jerry noticed that all the remaining numbers on the whiteboard were odd. What is the maximum possible number of integers on the whiteboard at that time?
In a race among 5 snails, there is at most one tie, but that tie can involve any number of snails. For example, the result of the race might be that Dazzler is first; Abby, Cyrus, and Elroy are tied for second; and Bruna is fifth. How many different results of the race are possible?
How many different remainders can result when the $100^{\text {th }}$ power of an integer is divided by 125 ?
In the following table, each question mark is to be replaced by "Possible" or "Not Possible" to indicate whether a nonvertical line with the given slope can contain the given number of lattice points (points both of whose coordinates are integers). How many of the 12 entries will be "Possible"?
Three different pairs of shoes are placed in a row so that no left shoe is next to a right shoe from a different pair. In how many ways can these six shoes be lined up?
Two straight pipes (circular cylinders), with radii 1 and $\frac{1}{4}$, lie parallel and in contact on a flat floor. The figure below shows a head-on view. What is the sum of the possible radii of a third parallel pipe lying on the same floor and in contact with both?
A group of 16 people will be partitioned into 4 indistinguishable 4 -person committees. Each committee will have one chairperson and one secretary. The number of different ways to make these assignments can be written as $3^{r} M$, where $r$ and $M$ are positive integers and $M$ is not divisible by 3 . What is $r$ ?
The Fibonacci numbers are defined by $F_{1}=1, F_{2}=1$, and $F_{n}=F_{n-1}+F_{n-2}$ for $n \geq 3$. What is $$ \frac{F_{2}}{F_{1}}+\frac{F_{4}}{F_{2}}+\frac{F_{6}}{F_{3}}+\cdots+\frac{F_{20}}{F_{10}} ? $$
How many of the values $P(2022), P(2023), P(2024)$, and $P(2025)$ are integers?
Each of 27 bricks (right rectangular prisms) has dimensions $a \times b \times c$, where $a, b$, and $c$ are pairwise relatively prime positive integers. These bricks are arranged to form a $3 \times 3 \times 3$ block, as shown on the left below. A $28^{\text {th }}$ brick with the same dimensions is introduced, and these bricks are reconfigured into a $2 \times 2 \times 7$ block, shown on the right. The new block is 1 unit taller, 1 unit wider, and 1 unit deeper than the old one. What is $a+b+c$ ?
In 2026, the following Cheenta students have been successful for Indian Statistical Institute's M.Stat Entrance. They ranked within the first 50 in the entire country in these entrances. I.S.I. M.Stat Entrance
In 2026, the following Cheenta students have been successful for Indian Statistical Institute's B.Stat Entrance and Chennai Mathematical Institute's B.Sc. Math Entrance. They ranked within the first 200 in the entire country in these entrances. Most of these students attended the problem solving workshops regularly, which happen 5 days every week. CMI B.Sc. Math Entrance […]
In 2025, 8 students from Cheenta Academy cracked the prestigious Regional Math Olympiad. In this post, we will share some of their success stories and learning strategies. The Regional Mathematics Olympiad (RMO) and the Indian National Mathematics Olympiad (INMO) are two most important mathematics contests in India.These two contests are for the students who are […]
Cheenta Academy proudly celebrates the success of 27 current and former students who qualified for the Indian Olympiad Qualifier in Mathematics (IOQM) 2025, advancing to the next stage — RMO. This accomplishment highlights their perseverance and Cheenta’s ongoing mission to nurture mathematical excellence and research-oriented learning.