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Addition and subtraction of matrices; multiplication by scalar.

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The matrices $A$, $B$ and $C$ are defined as:

\n

\\[A=\\var{A}\\qquad B=\\var{B}\\qquad C=\\var{C}\\]

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What is $A+B$ ?

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What is $B-C$ ?

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What is $\\var{p}A+\\var{q}C$ ?

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What is $\\var{p+1}C-\\var{q+1}B$ ?

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