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euler-project
euler-020 Factorial digit sum.ipynb
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In [1]:
100.
downto
(
1
)
.
inject
(
&
:
*
)
.
to_s
.
split
(
""
)
.
map
{
|
i
|
i
.
to_i
}
.
inject
&
:
+
Out[1]:
648
In [ ]: