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In this video, we discuss why k * n choose k = n * (n-1) choose (k-1). The combinatorial proof is discussed.

YouTube-Learn with Sreyas

2021/03/21

Prove that n-1 divides n^k-1 for n bigger or equal to 2 and for any positive integer k. We prove this using the Binomial Theorem.

YouTube-Thinking In Math

2023/01/21

Algebraic and Combinatorial Proofs: C(n,k)=C(n,n-k). 2.8K views · 1 year ago ...more. Mathispower4u. 292K.

YouTube-Mathispower4u

2022/07/05

What is Combinatorial Proof ? Why C(n, r) = C(n, n-r) ? : a Combinatorial proof | Part - 1. 5.2K views · 3 years ago ...more ...

YouTube-Learn with Sreyas

2021/03/14

Notes: https://drive.google.com/file/d/1Yp77IvDiqKMGvFayexBHbHQWTZx0k8ml/view?usp=sharing The investigated sums: (i) Sum from k =0 to n of ...

YouTube-AKSS

2023/06/21

Combinatorial Notation Formula nCk is the number of combinations of n objects selected k at a time.

YouTube-Cipher

2018/08/25

Please Subscribe here, thank you!!! https://goo.gl/JQ8Nys Using the Principle of Mathematical Induction to prove sum(1/(i(i + 1)), i = 1,...

YouTube-The Math Sorcerer

2014/10/01