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