[NTLUG:Discuss] What scripting change do I need to make?

[Leroy Tennison]

Using

     mkdir -p test/{1,2,3}

creates test/1, test/2 and test/3 as expected.  However

     mkdir -p test/{`seq -s, 1 3`}

creates test/{1,2,3}

What do I need to do to get the "seq" variant to produce the same result 
as the first command?