This problem collection is designed to be used by mathematics clubs, high school teachers, students, and other interested individuals. Clearly, no one would profit from doing all the problems, but he would benefit from those that present a challenge to him. The reader might try himself on a whole test or on part of a test, with (or preferably without) time limitations.
He should try to get as far as possible with the solution to a problem. If he is really stuck, he should look up the answer in the key, see page 47, and try to work backwards; if this fails, the section of complete solutions should be consulted, see pages 49–107.
In studying solutions, even the successful problem solver may find sidelights he had overlooked; he may find a more “elegant” solution, or a way of solving the problem which may lead him deeper into mathematics. He may find it interesting to change items in the hypothesis and to see how this affects the solution, or to invent his own problems.
If a reader is interested in a special type of problem, he should consult the classified index.
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