SOLUTION: how many permutations can be formed from five types of trees each of which is composed of two trees? without repeating

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Question 796324: how many permutations can be formed from five types of trees each of which is composed of two trees? without repeating
Answer by Alan3354(69443) About Me  (Show Source):
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how many permutations can be formed from five types of trees each of which is composed of two trees?
5*5 = 25
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without repeating
5*4 = 20