2024 Indonesia MO Problems

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Day 1

Problem 1

Find all ordered pair of positive real number $a, b$ which satisfy the following system of equations.

$\begin{aligned} \sqrt{a}+\sqrt{b}&=6 \\ \sqrt{a-5}+\sqrt{b-5}&=4 \end{aligned}$

Solution

Problem 2

Triplet of positive integer $(a, b, c)$ where $a < b < c$ is called fatal if there exist three non-zero integer $p, q, r$ which satisfy $a^pb^qc^r=1$. For example, (2,3,12) is fatal triplet since $2^23^112^{-1}=1$.

Natural number $N$ is called fatal if there exist fatal triplet $(a, b, c)$ such that $N = a+b+c$.

  1. Prove that 16 is not fatal.
  2. Prove that every integer greater than 16 that is not a multiple of 6 is fatal.


Solution

Problem 3

Solution

Problem 4

Solution

Day 2

Problem 5

Solution

Problem 6

Solution

Problem 7

Solution

Problem 8

Solution

See Also

2024 Indonesia MO (Problems)
Preceded by
2023 Indonesia MO
1 2 3 4 5 6 7 8 Followed by
2025 Indonesia MO
All Indonesia MO Problems and Solutions