I also CC to comp.theory. On 5月9日, 下午4时27分, Bin Chen <[EMAIL PROTECTED]> wrote: > (x) > (2) > > with the upper and lower parenthesis concatenated to a big > parenthesis, what math does this notation mean? I think there may have > two, one is 2^x, another is "select 2 elements from x, with the order, > how many combination the selection has". > > Which one is common? > > Thanks. > Bin
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