Magnitude of the projection of a vector on the normal to the plane of i + j + k and i + 2j + 3k

1. A.
   $3\sqrt{6}$ units
2. B.
   $\dfrac{\sqrt{3}}{2}$ units
3. C.
   $\dfrac{1}{6}$ units
4. D.
   $\sqrt{\dfrac{3}{2}}$ units

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1. A.
   $\sqrt{\frac{2}{6}}$
2. B.
   $\sqrt{\frac{1}{6}}$
3. C.
   $\sqrt{\frac{5}{6}}$
4. D.
   $\sqrt{\frac{7}{6}}$

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