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Mathematics
Mathematics
Problem
For the arithmetic progression 3, 7, 11, \dots\, the sum of the first
n
n
n
terms is 200. Which one of the following equations in
n
n
n
must be solved to find the required value of
n
n
n
? a)
4
n
2
+
2
n
−
200
=
0
4n^{2}+2n-200=0
4
n
2
+
2
n
−
200
=
0
b)
2
n
2
+
3
n
−
200
=
0
2n^{2}+3n-200=0
2
n
2
+
3
n
−
200
=
0
c)
2
n
2
+
n
−
200
=
0
2n^{2}+n-200=0
2
n
2
+
n
−
200
=
0
d)
2
n
2
+
n
−
100
=
0
2n^{2}+n-100=0
2
n
2
+
n
−
100
=
0
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