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Mathematics
Mathematics
Problem
In an AP, the first term is
5
5
5
and the common difference is
5
5
5
. If the sum of the first
n
n
n
terms is
275
275
275
, find
n
n
n
. a)
11
11
11
b)
7
7
7
c)
10
10
10
d)
9
9
9
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