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Mathematics
Problem
Which of the following expresses the
n
th
n^{\text{th}}
n
th
term of a geometric progression whose first term is
a
a
a
and common ratio
r
r
r
? a)
a
n
=
a
r
n
a_n = ar^{n}
a
n
=
a
r
n
b)
a
n
=
a
r
n
−
1
a_n = \dfrac{a}{r^{n-1}}
a
n
=
r
n
−
1
a
c)
a
n
=
a
r
n
−
1
a_n = ar^{n-1}
a
n
=
a
r
n
−
1
d)
a
n
=
a
+
(
n
−
1
)
r
a_n = a + (n-1)r
a
n
=
a
+
(
n
−
1
)
r
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