Under which one of the following conditions will the two planes x + y + z = 7 and alpha x + beta y + gamma z = 3,

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Q 2319780610.     Under which one of the following conditions will
the two planes x + y + z = 7 and alpha x + beta y + gamma z = 3,
be parallel (but not coincident)?
NDA 2008 Paper 1
A

alpha = beta = gamma =1

B

alpha = beta = gamma = 3/7

C

alpha = beta = gamma

D

None of these

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