This book has been the most wanted book during the times of placement . the questions in this books are often present in the aptitude test of the interviews.
The solutions given in this book are very easy to understand and well explained. The tips and tricks mentioned in this book are very effective and help a lot to save time.
I recommend this book for various competitive exams and company interviews as it is a very affordable and popular book and can be found in most bookstores easily.
This is a must buy book especially for engineers.