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JEEMAIN and NEET
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Mathematics
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Class11
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3-D Geometry
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The line $\overrightarrow r=(4\hat i+2\hat j+\alpha \hat k)+\lambda(\hat i+\hat j+2\hat k)$ lies on the plane $2x-4y+z=7$ if $\alpha=?$
$(a)\:\:7\:\:\:\:\qquad\:\:(b)\:\:-7\:\:\:\:\qquad\:\:(c)\:\:1\:\:\:\:\qquad\:\:(d)\:\:0$.
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