Thahani
11.10.2020 •
Engineering
Suppose that we are putting animals in a barn. There are three types of animals: horses, cows, and goats. The barn has a fixed number of stalls (partitions). These stalls are arranged in a single row, and are consecutive. Horses and cows are big, and each need 2 stalls. A goat is small, and only needs 1 stall. Stalls are not allowed to be empty. Assume that all horses are equivalent, all cows are equivalent, and all goats are equivalent.For example, in a barn with only 1 stall, you can only place 1 goat (G). In a barn with 2 stalls, you could have one horse (H), or one cow (C), or two goats (GG). In a barn with 3 stalls, there are 5 possible sequences: GGG, GH, GC, HG, CG.Find a recurrence relation that describes how many ways are there to arrange the animals into a barn with n stalls. Hint: think about the last animal in the row of stalls.
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Ответ:
* current model - electrons move around the nucleus in an electron cloud
* J. J. Thomson's model - electrons are spread throughout the atom
Explanation: