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Mathematics
Mathematics
Problem
The sum of the first
n
n
n
terms of an arithmetic progression with first term
25
25
25
and common difference
−
3
-3
−
3
is
112
112
112
. Determine
n
n
n
. a)
8
8
8
b)
10
10
10
c)
7
7
7
d)
4
4
4
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