# Pupils

Four pupils are going via the dark hall. Start at one side and have to get to the other side for 17 minutes. They have only one lamp for the trip. The corridor is narrow. They can go up two pupils at a time and at a slower speed. Each pupil went different speed. Carol passes hall in one minute, Peter in two minutes, Ibrahim in 5 minutes, and Hugo in 10 minutes. In what order do they go?

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Would you like to compute the count of combinations?

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