What's the rational in solving this operation with matrix?

user1234

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I don't understand how this result is obtained.
Thanks to those who will answer
 

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I don't understand how this result is obtained.
Thanks to those who will answer

It's much better to just attach a picture:
1602510414858.png
It would also help if you would put this in context. What problem are you trying to solve?

When you ask for the "rationale for using a matrix", what do you mean? I see no indication of a matrix, though I initially supposed (because of that question) that those are column vectors, rather than binomial coefficients, as they in fact are.

If you didn't realize that, the way to evaluate this is to use the nCr button on your calculator.
 
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