+0  
 
+11
388
3
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frownWhat is 9 +10?frown

 Feb 27, 2017
 #1
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+1

It is 21 laugh

 Feb 27, 2017
 #2
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0

\(x = {-b \pm \sqrt{b^2-4ac} \over 2a}\begin{pmatrix} 1\\ 2 \end{pmatrix}\sum_{}^{}\begin{bmatrix} 1 && 2 \\ 3 && 4 \end{bmatrix}=21\)

.
 Feb 27, 2017
 #3
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0

It's 19...

 

PS. I got the joke

 Feb 27, 2017

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