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Part of 2021 Malaysia IMONST 1

Problems(1)

10 girls in a class, with different heights 2021 Malaysia IMONST 1 Senior P3

Source:

9/20/2021
There are 1010 girls in a class, all with different heights. They want to form a queue so that no girl stands directly between two girls shorter than her. How many ways are there to form the queue?
combinatorics