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Mathematics
Mathematics
Problem
Which of the following pairs of vectors are perpendicular to each other? a)
(
1
,
1
,
1
)
(1,1,1)
(
1
,
1
,
1
)
and
(
1
,
1
,
1
)
(1,1,1)
(
1
,
1
,
1
)
b)
(
1
,
2
,
−
1
)
(1,2,-1)
(
1
,
2
,
−
1
)
and
(
2
,
−
1
,
0
)
(2,-1,0)
(
2
,
−
1
,
0
)
c)
(
1
,
1
,
2
)
(1,1,2)
(
1
,
1
,
2
)
and
(
2
,
−
1
,
0
)
(2,-1,0)
(
2
,
−
1
,
0
)
d)
(
0
,
1
,
2
)
(0,1,2)
(
0
,
1
,
2
)
and
(
2
,
1
,
0
)
(2,1,0)
(
2
,
1
,
0
)
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