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MathNet 2007-part-03 — 185 problems (EN–VI) Question 130

Math Olympiad Vault · MathNet 2007-part-03 — 185 problems (EN–VI)

Question 130

I have four distinct rings that I want to wear on my right hand (five distinct fingers). One of these rings is a Canadian ring that must be worn on a finger by itself, the rest I can arrange however I want. If I have two or more rings on the same finger, then I consider different orders of rings along the same finger to be different arrangements. How many different ways can I wear the rings on my fingers?