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14
2000 HMMT RMT Team #14
2000 HMMT RMT Team #14
Source:
March 8, 2024
algebra
Problem Statement
Define a sequence
<
x
n
>
<x_n>
<
x
n
>
of real numbers by specifying an initial
x
0
x_0
x
0
and by the recurrence
x
n
+
1
=
1
+
x
n
1
−
x
n
x_{n+1}=\frac{1+x_n}{1-x_n}
x
n
+
1
=
1
−
x
n
1
+
x
n
. Find
x
n
x_n
x
n
as a function of
x
0
x_0
x
0
and
n
n
n
, in closed form. There may be multiple cases.
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