What is the distance between the planes x - 2 y + z - 1 = 0 and -3x + 6 y - 3z + 2 =0 ?

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Q 2309723618.     What is the distance between the planes

x - 2 y + z - 1 = 0 and -3x + 6 y - 3z + 2 =0 ?
NDA 2013 Paper 1
A

3 units

B

1 unit

C

0

D

None of these

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