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Question

The condition that the line xαl=yβm=zγn in the plane Ax+By+Cz+D=0 is

A
Aα+Bβ+Cγ+D=0 and Al+Bm+Cn0
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B
Aα+Bβ+Cγ+D0 and Al+Bm+Cn=0
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C
Aα+Bβ+Cγ+D=0 and Al+Bm+Cn=0
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D
Aα+Bβ+Cγ=0 and Al+Bm+Cn=0
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Solution

The correct option is C Aα+Bβ+Cγ+D=0 and Al+Bm+Cn=0
The line xα1l=yβ1m=zγ1n in the plane Ax+By+Cz+D=0
then multiplication sum id corresponding direction ratio will be zero so here Al+Bm+Cn=0
and one thing more line passes through (α1,β1,γ1)
So, plane Also passe through (α1,β1,γ1)
hence Aα1+Bβ1+Cγ1+D=0

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