Question:
If for some $\alpha$ and $\beta$ in $R$, the intersection of the following three places
$x+4 y-2 z=1$
$x+7 y-5 z=\beta$
$x+5 y+\alpha z=5$
is a line in $\mathrm{R}^{3}$, then $\alpha+\beta$ is equal to:
Correct Option: 1
Solution:
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