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Mathematics
Mathematics
Problem
If
x
,
y
,
z
x, y, z
x
,
y
,
z
are three numbers in arithmetic progression, which of the following relations must be true? a)
y
2
=
x
z
y^{2}=xz
y
2
=
x
z
b)
z
−
y
=
x
−
y
z-y=x-y
z
−
y
=
x
−
y
c)
y
=
x
+
z
2
y=\dfrac{x+z}{2}
y
=
2
x
+
z
d)
y
−
x
=
z
−
x
y-x = z-x
y
−
x
=
z
−
x
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