How can double counting be used to show that k*(n choose k) = n *((n-1) c
Chapter9: Sequences, Probability And Counting Theory
Section9.6: Binomial Theorem
Problem 3SE: What is the Binomial Theorem and what is its use?
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How can double counting be used to show that k*(n choose k) = n *((n-1) choose (k-1)?
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