Question: 17. Show that For a combinatorial argument, consider a set of n items and fix attention on one of these items. How many different sets

17. Show that

(n-1 (n-1 (*)=(})+(7) r

For a combinatorial argument, consider a set of n items and fix attention on one of these items. How many different sets of size r contain this item, and how many do not?

(n-1 (n-1 (*)=(})+(7) r

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