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<table border=1 align="center" class="tableau"><tr><td>
\( y_2 \) &nbsp;</td><td>&nbsp; \( y_3 \) &nbsp;</td><td>&nbsp; &nbsp;</td><td>&nbsp; </td></tr><tr><td>
\( -\frac{1}{2} \) &nbsp;</td><td>&nbsp; \( -\frac{1}{2} \) &nbsp;</td><td>&nbsp; \( 2 \) &nbsp;</td><td>&nbsp; \( y_{1} \)</td></tr><tr><td>

<b> 4</b>   &nbsp;</td><td>&nbsp; \( -1 \) &nbsp;</td><td>&nbsp; \( 8 \) &nbsp;</td><td>&nbsp; \( y_{4} \)</td></tr><tr><td> 
<b> 12</b>   &nbsp;</td><td>&nbsp; \( -3 \) &nbsp;</td><td>&nbsp; \( -12 \) &nbsp;</td><td>&nbsp; </td></tr></table>


<div class="math">\(\lambda = \min\{ \frac{8}{4}\} = 2.\)</div>
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