The following identity is known as Fermats combinatorial identity: Give a combinatorial argument (no computations are needed)

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The following identity is known as Fermat€™s combinatorial identity:
The following identity is known as Fermat€™s combinatorial identity:Give a

Give a combinatorial argument (no computations are needed) to establish this identity.
Consider the set of numbers 1 through n. How many subsets of size k have i as their highest numbered member?

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