00312nam a2200109 a 450000500170000002000150001708200150003210000210004724500470006826000630011530000240017820251203110154.0  a0883857103  a511.6bMAR  aMarcus, Daniel A  aCombinatoricsba problem oriented approach  aWashington D.C.bMathematical association of Americac1998  ax,136p.c23 cm P.B.