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Mathematics 19 Online
OpenStudy (anonymous):

I don't understand this? http://oi42.tinypic.com/f4im4i.jpg What is a13, and how do I find it?

ganeshie8 (ganeshie8):

how many rows it has ? how many columns it has ?

OpenStudy (anonymous):

it's: \[a_{1,3}\] row one, column three

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