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II-A 7.26 b

 
 
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Re: II-A 7.26 b
by Areteem Professor - Monday, February 1, 2021, 2:50 PM
 

Hint: note that $a_{n-1}$ does not include the case "invite all the $n-1$ friends", but when you have $n$ friends to choose from, this should be possible as well.