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Mathematics
Mathematics
Problem
The sum of
n
n
n
terms of two A.P.'s are in the ratio of
(
n
+
7
)
:
(
3
n
+
11
)
(n + 7) : (3n + 11)
(
n
+
7
)
:
(
3
n
+
11
)
. The ratio of their 9th term is ________.
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