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A Question about Combinatorica


Dear Sir,

I have a question about Combinatorics.

If we have four different letters as A, B, C, D .

A text book mentions that Q(4,4)/2 = 3 different combinations. What the
meaning of Q & why division by 2 ?

How can I do this by Mathematica with combinatorica package?

I need really for your advice

Thanks too much

*Marwa Ali Abd El Wahaab*
*Teaching Assistant *
Faculty of Engineering
Mansoura University



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