TY  - BOOK
AU  - Brualdi, Richard A.
TI  - Introductory combinatorics
SN  - 9789353433062
U1  - 511.6 BRU-R 
PY  - 2020///
CY  - India
PB  - Pearson
KW  - Combinatorial analysis
KW  - Pigeonbole
KW  - Permutations
ER  -