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3

Part of 2007 Puerto Rico Team Selection Test

Problems(1)

no of ways of 5 person of different heights ... Puerto Rico TST 2007.3

Source:

9/15/2021
Five persons of different heights stand next to the another on numbered booths to take a picture. From how many ways can be arranged so that people in positions 1 1 and 33 are both taller than the person in the position 22?
combinatorics