00274nam a2200109Ia 4500100002300000654001600023245005800039260003200097082001500129300000800144546001200152  aBalakrishan/ V.K.   aMathematics  aSchaums outline of theory & problems of combinatorics  bMcGraw HillaNew yorkc1995  a511.6bBAL  a200  aENGLISH