There are 4 first, second, third, and fourth grades each in a high school. In how many
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Question:
There are 4 first, second, third, and fourth grades each in a high school. In how many ways can the logbooks of these classes be placed on a desk one on top of the other if:
(a) at the very bottom should lie all the logbooks of the first classes
b) at the very top lie the books of form A, below - those of form B, below - those of form C, and below - those of form D?
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