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UPSC NDA I 2013 Mathematics Paper

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Question : 30

Total: 120

If the straight line ‌

is parallel to the plane ax+by+cz+d=0 then which one of the following is correct?

ℓ+m+n=0
a+b+c=0
‌
a
ℓ
+‌
b
m
+‌
c
n
=0
aℓ+bm+cn=0

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