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Short Answer: It doesn't matter.
Long Answer
Some postures are said to be more conducive to concentration, and perhaps this is true to a certain extent. Perhaps there is something with certain hand placements which may help keep people a bit more focused (maybe the bare attention required to keep fingers barely touching, for instance). However, don't make too much of this. Ultimately, how you sit is a means to help facilitate your concentration and mindfulness, unless you believe that your suffering in life can be solved by how you hold your hands.