Good

This book covers everything with great details of the main topics and straight to the point.Exercise are vast and I highly recommend you this book if you are studying probability or econometrics.Many derivations are done using discrete maths.So take your time and slowly absorb the materials.Also a vast array of examples are done and it has great rigor.
This book is a must have for students who are having stats

This book is usefull for msqms isi aspirants.

Must buy