There was a certain number of crows sitting on trees in the garden. If there had been just one crow sitting on each tree, then one crow would not have had a tree to sit on. However, if two crows had been sitting on each tree, then there would not be any crows on one tree. How many trees were there in the garden?, In how many ways can 5 students be seatedin a row of 5 seats?, How many different numbers of 3 different digits each can be made from the digits 1, 3, 5, 7, 9?, How many different symbols each consisting of 4 letters in succession can be formed from letters a, b, c, d, e (repetitions are permitted)?, In how many ways can we select: A committee of 3 from a group of 10 people?, In how many ways can we select: A set of 3 books from a set of 7 different books?, In how many ways can we select: A set of 3 maths books and 5 physics books, all are different?, A group of children is standing by some benches in a park. If three children sit on each bench, one child is left standing. If four children sit on each bench, one bench is left empty. How many children are there, and how many benches?, Some students are waiting in a classroom with several desks. If two students sit at each desk, one student has no desk. If three students sit at each desk, one desk remains empty. How many students are there, and how many desks?.

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