- #1

dpa

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Hi All,

This is algebraic proof of Vandermonde's identity:

I am having some problem understanding how we reached the second last step and more importantly, last steps from revious steps.

src::proofwiki.org

I would be grateful if someone would elaborate it clearly.

Basically none that are relevant to answer my question.

I have no idea how we reached the last two steps.

Thank You.

## Homework Statement

This is algebraic proof of Vandermonde's identity:

I am having some problem understanding how we reached the second last step and more importantly, last steps from revious steps.

src::proofwiki.org

I would be grateful if someone would elaborate it clearly.

## Homework Equations

Basically none that are relevant to answer my question.

## The Attempt at a Solution

I have no idea how we reached the last two steps.

Thank You.

#### Attachments

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