Prove that for n>=2,2 cdot (begin{matrix}{n}{2}end{matrix})+(begin{matrix}{n}{1}end{matrix})=n^2

generals336

generals336

Answered question

2021-01-10

Prove that for n2,2(n2)+(n1)=n2

Answer & Explanation

Ayesha Gomez

Ayesha Gomez

Skilled2021-01-11Added 104 answers

Prove that for
n2,2(n2)+(n1)=n2
Step 1. Definitions
Definition combination
nCr=(nr)=n!r!(nr)!
with n!=n×(n1)××2×1.
Pascals

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