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| 1. |
\left. \begin{array} { l } { - k ) \text { is the HCF of } x ^ { 2 } + x - 12 \text { and } 2 x ^ { 2 } - k x - 9 \text { then th } } \\ { 0 } \\ { 3 } \end{array} \right. |
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