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Mathematics
Problem
The equation of a plane which bisects the line joining (1, 5, 7) and (-3, 1, -1) is
x
+
y
+
2
z
=
λ
x + y + 2z = \lambda
x
+
y
+
2
z
=
λ
, then
λ
\lambda
λ
must be .....
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