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July 11th, 2017, 02:55 PM  #1 
Member Joined: Apr 2017 From: PA Posts: 45 Thanks: 0  Find the distribution of the sum Xsubscript1 + Xsubscipt2.*
How do u write out a 3 × 2 matrix?

July 11th, 2017, 05:26 PM  #2 
Senior Member Joined: Sep 2015 From: USA Posts: 2,316 Thanks: 1230 
$\begin{pmatrix} a_{1,1} &a_{1,2} \\ a_{2,1} &a_{2,2} \\ a_{3,1} &a_{3,2} \end{pmatrix}$ reply while quoting to see the LaTex code this is just one way of doing this. you can use \matrix for no parens, or \bmatrix for brackets The \array command gives you more flexibility if you want it with regard to justification within a column. 
July 11th, 2017, 05:50 PM  #3 
Member Joined: Apr 2017 From: PA Posts: 45 Thanks: 0 
Hey Romsek, sorry, I am unable to see the code. 
July 11th, 2017, 07:31 PM  #4 
Senior Member Joined: Dec 2012 From: Hong Kong Posts: 853 Thanks: 311 Math Focus: Stochastic processes, statistical inference, data mining, computational linguistics  

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distribution, find, sum, xsubscipt2, xsubscript1 
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