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If the equation of plane passing through the mirror image of a point (2,3,1) with respect to line `(x+1)/(2)=(y-3)/(1) = (z+2)/(-1)` and containing the line `(x-2)/(3)=(1-y)/(2)=(z+1)/(1)` is `alpha x +betay + gammaz=24`, then `alpha +beta+gamma` is equal to :

A

21

B

18

C

19

D

20

Text Solution

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The correct Answer is:
C
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