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Mathematics
Mathematics
Problem
The points
A
(
1
,
2
,
3
)
A(1,2,3)
A
(
1
,
2
,
3
)
,
B
(
4
,
k
,
6
)
B(4,k,6)
B
(
4
,
k
,
6
)
and
C
(
7
,
8
,
9
)
C(7,8,9)
C
(
7
,
8
,
9
)
are collinear for a)
k
=
6
k=6
k
=
6
b)
k
=
5
k=5
k
=
5
c)
k
=
4
k=4
k
=
4
d)
k
=
−
1
k=-1
k
=
−
1
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