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If the foot of the perpendicular drawn f...

If the foot of the perpendicular drawn from `(1,9,7)` to the line passing through the point `(3,2,1)` and parallel to the planes `x+2y+z=0` and `3y-z=3` is `(a,beta`,then `alpha+beta+7` is equal to

A

-1

B

5

C

1

D

3

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