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Mathematics
Mathematics
Problem
The three expressions
3
x
+
1
3x+1
3
x
+
1
,
2
x
+
5
2x+5
2
x
+
5
and
5
x
+
9
5x+9
5
x
+
9
are written in that order. For which value of
x
x
x
do they form an arithmetic progression? a)
−
4
-4
−
4
b)
0
0
0
c)
5
2
\dfrac{5}{2}
2
5
d)
−
12
-12
−
12
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