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Mathematics
Mathematics
Problem
Find the value of
∑
n
=
1
13
(
i
n
+
i
n
+
1
)
\sum_{n=1}^{13} (i^n + i^{n+1})
∑
n
=
1
13
(
i
n
+
i
n
+
1
)
(where,
i
=
−
1
i = \sqrt{-1}
i
=
−
1
)
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