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Mathematics
Problem
If
P
1
P
2
P_1P_2
P
1
P
2
is perpendicular to
P
2
P
3
P_2P_3
P
2
P
3
, then the value of
k
k
k
is, where
P
1
(
k
,
1
,
−
1
)
P_1(k, 1, -1)
P
1
(
k
,
1
,
−
1
)
,
P
2
(
2
k
,
0
,
2
)
P_2(2k, 0, 2)
P
2
(
2
k
,
0
,
2
)
and
P
3
(
2
+
2
k
,
k
,
1
)
P_3(2 + 2k, k, 1)
P
3
(
2
+
2
k
,
k
,
1
)
is .....
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