If the vectors \[a\mathbf{i}+b\mathbf{j}+c\mathbf{k}\] and \[p\mathbf{i}+q\mathbf{j}+r\mathbf{k}\] are perpendicular, then [RPET 1989]

If the vectors \[a\mathbf{i}+b\mathbf{j}+c\mathbf{k}\] and \[p\mathbf{

1.	If the vectors \[a\mathbf{i}+b\mathbf{j}+c\mathbf{k}\] and \[p\mathbf{i}+q\mathbf{j}+r\mathbf{k}\] are perpendicular, then [RPET 1989]
A.	\[(a+b+c)\,(p+q+r)=0\]
B.	\[(a+b+c)\,(p+q+r)=1\]
C.	\[ap+bq+cr=0\]
D.	\[ap+bq+cr=1\]
Answer» D. \[ap+bq+cr=1\]

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If the vectors \[a\mathbf{i}+b\mathbf{j}+c\mathbf{k}\] and \[p\mathbf{i}+q\mathbf{j}+r\mathbf{k}\] are perpendicular, then [RPET 1989]

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