2006 Indonesia MO Problems
Find all pairs of real numbers which satisfy and .
Let be positive integers. If , prove that .
Let be the set of all triangles which have property: are positive integers. Prove that all triangles in are similar.
A black pawn and a white pawn are placed on the first square and the last square of a chessboard, respectively. Wiwit and Siti move alternatingly. Wiwit has the white pawn, and Siti has the black pawn. The white pawn moves first. In every move, the player moves her pawn one or two squares to the right or to the left, without passing the opponent's pawn. The player who cannot move anymore loses the game. Which player has the winning strategy? Explain the strategy.
In triangle , is the midpoint of side and is the centroid of triangle . A line passes through , intersecting line at and line at , where and . If denotes the area of triangle , show that .
Every phone number in an area consists of eight digits and starts with digit . Mr. Edy, who has just moved to the area, apply for a new phone number. What is the chance that Mr. Edy gets a phone number which consists of at most five different digits?
Let be real numbers such that are rational numbers. Prove that there are integers , not all of them are , such that .
Find the largest -digit integer which has property: the sum of its digits equals to the product of its digits.
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