Question: Show (6.9) by expressing the binomial coefficient Z+1 r as a ratio of a descending factorial and r!, multiplying and dividing by Z+1g rg

 Show (6.9) by expressing the binomial coefficient Z+1 r



as a ratio of a descending factorial and r!, multiplying and dividing by Z+1−g r−g



, simplifying, and then using (1.55).

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