Brain Teasers for Clever People

by Kiran Srinivas

Book Overview

To succeed in life, you must think outside the box. This clich This description may be from another edition of this product.

• Format: Paperback
• Language: English
• ISBN: 1885003994
• ISBN13: 9781885003997
• Release Date: January 2010
• Publisher: Robert Reed Publishers
• Length: 126 Pages
• Weight: 0.50 lbs.
• Dimensions: 0.4" x 6.1" x 9.0"

Customer Reviews

Mistake in Teaser #18

The answer to Brain Teaser #18 is incorrect. !Spoiler Alert! The answer should be 27000001. The problem is that all the digital sums are not 55 as the answer key suggests. For example consider the pair: (10 - 999,990) Here the digital sum is 46! In fact if you break it down only 450000 of the sums are 55, 45000 of the sums are 46, 4500 are 37, 450 are 28, 45 are 19 and 4 are 10. So the method of solution is not viable because the above would be difficult to figure out (I used a computer). Rather the proper analysis is to show that each place value contributes 100000 of each number for 1-999,999 (e.g, there are 100000 1's in the ones column, 100000 1's in the tens column, and so on) So you get 600000 * 1 + 600000 *2 ... 600000 *9 = 600000 (1+2+3+4+5+6+7+8+9) = 600000 * 45 = 27,000,000 But you need to add 1 for 1,000,000 So the final answer is 27000001 This is also verified by the following Mathematica brute force program: digitalSum[x_] := Total[Flatten[IntegerDigits[Table[i,{i,1,x}]]]] digitalSum[1000000] 27000001 Don't know of any other mistakes and otherwise the book is excellent!!

Top notch

The problem with many "brain teaser" books is that they all have many of the same questions. That is not the case with this book. The questions in this book are challenging and fun. Makes for a great book to keep at the office to break up the monotony of the work day.

Great book

Excellent book, especially for those who are preparing for a case interview, I would recommend it for everyone. Easy reading and superb explanation!

Dangerously entertaining

Wow! This book is so much fun. But I am warning you that it is also very addictive so make sure that you have the time and patience. I would love to see some follow-ups since I'm almost all the way through. Thanks!!!

Kiran - The "K" is for klever

Kiran is a mental giant and this book only begins to touch on the type of brain teasers he must have at his disposal. Above all, the photo on the inside cover shows that Kiran is also dashing and witty. Watch out, ladies!