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Mathematics
Problem
Let
(
p
,
q
,
r
)
(p, q, r)
(
p
,
q
,
r
)
be a point on the plane
2
x
+
2
y
+
z
=
6
2x + 2y + z = 6
2
x
+
2
y
+
z
=
6
, then the least value of
p
2
+
q
2
+
r
2
p^2 + q^2 + r^2
p
2
+
q
2
+
r
2
is equal to a. 4 b. 5 c. 6 d. 8
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