TY  - BOOK
AU  - Singh, Rajesh
TI  - Goodwill's skills builders challenging math problems
SN  - 9788172454715
AV  - QA 139 .S56 [2015]
PY  - 2015///]
CY  - New Delhi, India
PB  - Goodwill Publishing House
KW  - Mathematics
KW  - Problems, exercises, etc
ER  -