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दो सरल रेखाओ के दिक्अनुपात l,m,n और `l_(1),m_(1),n_(1)` है | रेखाएँ एक-दूसरे पर लम्ब होगी यदि

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दो सरल रेखाओ के दिक्अनुपात l,m,n और `l_(1),m_(1),n_(1)` है | रेखाएँ एक-दूसरे पर लम्ब होगी यदि
A. `(1)/(l_(1))=(m)/(m_(1))=(n)/(n_(1))`
B. `(1)/(l_(1))=(m)/(m_(1))=(n)/(n_(1))=0`
C. `ll_(1)+mm_(1)+nn_(1)=0`
D. `ll_(1)+mm_(1)+nn_(1)=1`
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Correct Answer - C
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