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Double Decks choose m cards from 2 decks of n cards (9+1+x)(唱+吃+z)…(a%+xh+x品) of m-order terms coefficient of xm in (1+x+2)" Double Decks (x0 1 + x1 1 + x2 1) (x0 2 + x1 2 + x2 2) ···(x0 n + x1 n + x2 n) # of m-order terms (1 + x + x2) n coefficient of xm in 2 deck of s n cards choose m cards from
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