0,7

This is a triangle of card matching numbers. Two decks each have n kinds of cards, 5 of each kind. The first deck is laid out in order. The second deck is shuffled and laid out next to the first. A match occurs if a card from the second deck is next to a card of the same kind from the first deck. Triangle T(n,k) is the number of ways of achieving exactly k matches (k=0..5n). The probability of exactly k matches is T(n,k)/(5n)!.

rows are of length 1,6,11,16,...

F. N. David and D. E. Barton, Combinatorial Chance, Hafner, NY, 1962, Ch. 7 and Ch. 12.

F. F. Knudsen and I. Skau, On the Asymptotic Solution of a Card-Matching Problem, Mathematics Magazine 69 (1996), 190-197.

B. H. Margolius, The Dinner-Diner Matching Problem, Mathematics Magazine, 76 (2003), 107-118.

S. G. Penrice, Derangements, permanents and Christmas presents, The American Mathematical Monthly 98(1991), 617-620.

J. Riordan, An Introduction to Combinatorial Analysis, Wiley, 1958, p. 174-178.

R. P. Stanley, Enumerative Combinatorics Volume I, Cambridge University Press, 1997, p. 71.

Index entries for sequences related to card matching

Barbara H. Margolius, Dinner-Diner Matching Probabilities

G.f.: sum(coeff(R(x, n, k), x, j)*(t-1)^j*(n*k-j)!, j=0..n*k) where n is the number of kinds of cards, k is the number of cards of each kind (here k is 5) and R(x, n, k) is the rook polynomial given by R(x, n, k)=(k!^2*sum(x^j/((k-j)!^2*j!))^n (see Stanley or Riordan). coeff(R(x, n, k), x, j) indicates the of coefficient x^j of the rook polynomial.

There are 360,000 ways of matching exactly 2 cards when there are 2 different kinds of cards, 5 of each in each of the two decks so T(2,2)=360,000.

p := (x, k)->k!^2*sum(x^j/((k-j)!^2*j!), j=0..k); R := (x, n, k)->p(x, k)^n; f := (t, n, k)->sum(coeff(R(x, n, k), x, j)*(t-1)^j*(n*k-j)!, j=0..n*k);

for n from 0 to 4 do seq(coeff(f(t, n, 5), t, m), m=0..5*n); od;

Cf. A008290, A059056-A059071.

Sequence in context: A076005 A104592 A135379 this_sequence A121012 A151985 A105188

Adjacent sequences: A059060 A059061 A059062 this_sequence A059064 A059065 A059066

nonn,tabf,nice

Barbara Haas Margolius (margolius(AT)math.csuohio.edu)