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Friday, September 10, 2010

Matrices for shop-keepers

In Nigerian folklore,
someone called out to a young child, "Emeka what is four plus four?"
The child, frowning, said "eh, I don't know."

The same person asked, "Emeka, what is four naira plus four naira?"
The kid proudly announced, "ahahn, that na eight naira now!"

I think Seun told me this joke.
Let's learn matrix multiplication. Can you solve this?

If you're like Emeka, think of the above matrix multiplication as:

If you can write in matrix form all your:
eggs from two shops, milk from two shops, and sugar from two shops in three columns,
then you can do the following matrix multiplication:

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