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Mathematics
Problem
The shortest distance between a diagonal of a unit cube and a diagonal of a face skew to it is a.
1
2
\frac{1}{2}
2
1
b.
1
2
\frac{1}{\sqrt{2}}
2
1
c.
1
3
\frac{1}{\sqrt{3}}
3
1
d.
1
6
\frac{1}{\sqrt{6}}
6
1
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