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

generals336 2021-01-10 Answered

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

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Expert Answer

Ayesha Gomez
Answered 2021-01-11 Author has 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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