The value of \[aa'+\,bb'+\,cc'\]being negative the origin will lie in the acute angle between the planes \[an+by+cz+d=0\] and \[a'x+b'y+c'z+d'=0\], if [MP PET 2003]

d and \[d'\]are of opposite sign

The value of \[aa'+\,bb'+\,cc'\]being negative the origin will lie in

1.	The value of \[aa'+\,bb'+\,cc'\]being negative the origin will lie in the acute angle between the planes \[an+by+cz+d=0\] and \[a'x+b'y+c'z+d'=0\], if [MP PET 2003]
A.	\[a=a'=0\]
B.	d and \[d'\]are of same sign
C.	d and \[d'\]are of opposite sign
D.	None of these
Answer» C. d and \[d'\]are of opposite sign

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The value of \[aa'+\,bb'+\,cc'\]being negative the origin will lie in the acute angle between the planes \[an+by+cz+d=0\] and \[a'x+b'y+c'z+d'=0\], if [MP PET 2003]

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