Give a combinatorial proof: Forn and k satisfying 1

Linear Algebra: A Modern Introduction
4th Edition
ISBN:9781285463247
Author:David Poole
Publisher:David Poole
Chapter1: Vectors
Section1.1: The Geometry And Algebra Of Vectors
Problem 24EQ
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Combinatorial proof question attached.

Give a combinatorial proof: For n and k satisfying 1 < k < n,
nk = k. (j – 1)k-1.
j=k
Transcribed Image Text:Give a combinatorial proof: For n and k satisfying 1 < k < n, nk = k. (j – 1)k-1. j=k
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