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Mathematics
Mathematics
Problem
In an arithmetic progression, the first term is
5
5
5
and the common difference is
3
3
3
. If the sum of the first
n
n
n
terms is
170
170
170
, which one of the following equations in
n
n
n
must be satisfied? a)
3
n
2
+
10
n
−
340
=
0
3n^{2}+10n-340=0
3
n
2
+
10
n
−
340
=
0
b)
3
n
2
−
7
n
−
340
=
0
3n^{2}-7n-340=0
3
n
2
−
7
n
−
340
=
0
c)
3
n
2
+
7
n
−
340
=
0
3n^{2}+7n-340=0
3
n
2
+
7
n
−
340
=
0
d)
3
n
2
+
7
n
−
170
=
0
3n^{2}+7n-170=0
3
n
2
+
7
n
−
170
=
0
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