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Problem
Problem
Let
f
:
{
x
1
,
x
2
,
x
3
}
→
{
1
,
2
,
3
,
4
,
…
,
13
}
f: \{x_1, x_2, x_3\} \rightarrow \{1, 2, 3, 4, \dots, 13\}
f
:
{
x
1
,
x
2
,
x
3
}
→
{
1
,
2
,
3
,
4
,
…
,
13
}
be a function. The number of functions 'f' such that
f
(
x
i
+
1
)
−
f
(
x
i
)
=
2
f(x_{i+1}) - f(x_i) = 2
f
(
x
i
+
1
)
−
f
(
x
i
)
=
2
for
i
=
1
,
2
i = 1, 2
i
=
1
,
2
is
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