>>Hi everybody,
>>
>>Trying to figure out what does this 3rd grade question mean:
>>
>>"Why do you sometimes have only one multiplication sentence for an array?"
>>
>>Actually, I think after I wrote this question, I figured this out (I guess this is what it meant):
>>
>>It's when you have a number squared. 3x3, 4x4, etc.
>
>Because the array is a matrix ?
>
>You can multiply two matrixes, or you can multiply a matrix and a scalar
>
> http://en.wikipedia.org/wiki/Frobenius_inner_product#Frobenius_inner_product

And sometimes 3x3 is used to describe an array as 3 by 3 which would be a three by three array.