The answer to this question uses the phrase "multinomial of size".
What is the definition of the size of a multinomial? They are using a negative multinomial.
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The size is a metric on on an elementary event, which is defined as a sequence of multinomial events before a stopping event occurs. Each multinomial event can have $n$ outcomes where $n \geq 2$. It is not a metric on the number of outcomes of each trial.
DavidW
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so, the size is the length of the sequence? – Omar Shehab Oct 29 '20 at 08:40
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1That's how I read it. In the linked question, the answer refers to the "multinomial of size" and this is confusing. – DavidW Oct 29 '20 at 09:31
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Understood. Thanks. – Omar Shehab Oct 29 '20 at 12:39