Q 2369391215.     Under what condition are the two lines

`y = m/l x + alpha , z= n/l x + beta` and `y= (m')/(l') x + alpha '`,

`z =( n')/(l') x + beta'` orthogonal'?

NDA 2008 Paper 1 April
A

`alpha alpha' + beta beta' +1 =0`

B

`(alpha + alpha ') (beta + beta') =0`

C

`ll'+mm'+n n'= 1`

D

`ll'+mm'+n n' =0`

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