## Calculates the addition and subtraction of two matrices.

 $\hspace{30}C=A\pm B\\\vspace{5}\normal{\left[\begin{array}\vspace{15} c_{\small 11}& \cdots& c_{\small 1k}\\\vspace{15} c_{\small 21}& \cdots& c_{\small 2k}\vspace{25}\\ \vdots& \ddots& \vdots\vspace{15}\\c_{\small i1}& \cdots& c_{\small ik}\\\end{array}\right]}= {\left[\begin{array}\vspace{5} a_{\small 11}\pm b_{\small 11}& \cdots& a_{\small 1j}\pm b_{\small 1j}\\\vspace{5} a_{\small 21}\pm b_{\small 21}& \cdots& a_{\small 2j}\pm b_{\small 2j}\vspace{10}\\ \vdots& \ddots& \vdots\vspace{5}\\a_{\small i1}\pm b_{\small i1}& \cdots& a_{\small ij}\pm b_{\small ij}\\\end{array}\right]}\\$
 (enter a data after click each cell in matrix) matrix A {aij} matrix B {bij} operation A+B A-B B-A 6digit10digit14digit18digit22digit26digit30digit34digit38digit42digit46digit50digit addition/subtraction
 Matrices can be added or subtracted only if they have the same size.$C=A\pm B\hspace{30}\normal c_{ij}=a_{ij}\pm b_{ij}\\$
 [1-2] /2 Disp-Num5103050100200
[1]  2018/11/16 03:07   Female / 20 years old level / High-school/ University/ Grad student / Useful /
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for my class
[2]  2017/09/02 04:53   Male / 50 years old level / Self-employed people / Useful /
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understand different levels
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how many six number combinations using 25 numbers and each number only one time in any combination.

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