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Mathematics
Problem
If
S
n
S_n
S
n
denotes the sum of the first
n
n
n
terms of a sequence, which of the following gives the
n
n
n
th term
a
n
a_n
a
n
in terms of consecutive sums? a)
S
n
−
S
n
−
1
n
\dfrac{S_n-S_{n-1}}{n}
n
S
n
−
S
n
−
1
b)
S
n
n
\dfrac{S_n}{n}
n
S
n
c)
S
n
−
S
n
−
1
S_n-S_{n-1}
S
n
−
S
n
−
1
d)
S
n
S
n
−
1
\dfrac{S_n}{S_{n-1}}
S
n
−
1
S
n
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