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Mathematics
Problem
For what value of
k
k
k
, are the numbers
x
x
x
,
(
2
x
+
k
)
(2x + k)
(
2
x
+
k
)
and
(
3
x
+
6
)
(3x + 6)
(
3
x
+
6
)
three consecutive terms of an A.P.?
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