2017-12-15 03:08
Source:Sent to me by Gaurav Sinha
Problem:Siddhant writes a Maths test and correctly answers 5 out of 6 Arithmetic questions and 20 out of 28 Geometry questions. In total, Siddhant s… Read More
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Quant, Math & Computer Science Puzzles for Interview Preparation & Brain TeasingA collection of ~225 Puzzles with Solutions (classified by difficulty and topic)
2017-03-09 13:48
Source: Alok Goyal (Stellaris VP, Ex-Helion VC) puzzle blogProblem: A fast food restaurant sells dimsums in boxes of 7 and 3. What’s the greatest number of dimsums a person cannot buy… Read More
2016-07-27 13:33
Problem:There are two maternity hospitals in a town with 50 and 500 beds. Given full occupancy on a particular day, which of these hospitals is more likely to have equal no of boys and girls… Read More
2016-06-29 19:27
Source: Alok Goyal (Stellaris VP) puzzle blogProblem:
This is another famous puzzle in the Martin Gardner collection, and variations of this puzzle exist in different “sizes”. Th… Read More
2015-09-13 18:03
Source: Alok Goyal's Puzzle PageProblem:
In a line up of 10 soldiers, what is the least number of soldiers that can be picked in order of either ascending or descending heights? Assume… Read More
2015-04-15 18:01
Source: Sent to me by Prateek Chandra Jha (IIT Bombay)Problem:
This problem is inspired by the Cheryl's Birthday Puzzle (FB Post, Guardian Link).
Paul, Sam and Dean are assigned the task of… Read More
2015-03-06 05:47
Source: Alok Goyal Puzzle Page ( http://alokgoyal1971.com/ ) . Alok is ex-IIT Delhi, Partner at Helion VC
Problem:Part I (Easy): Using a clock, divide a pizza among 12 peoplePart II (Diff… Read More
2015-02-18 13:11
Source: Asked to me by Ankush Jain (CSE IITB 2011, Morgan Stanley Quant Associate). He took it from Algorithms Design book by Tardos and Kleinberg
Problem:
Easy case:
You’re tryi… Read More
2015-01-23 10:31
Source: Sent to me by Sudeep KamathProblem:Airline check-in baggage has size restriction by so-called linear dimension: length + breadth + height should not exceed 62 inches. P… Read More
2015-01-21 10:30
Source: Mailed to me by Kushagra Singhal, Ex-IIT Kanpur, PhD Student at University of Illinois at Urbana-ChampaignProblem:
Prove that for any positive K and a natural number n, every (n*K)t… Read More
2015-01-19 11:00
Source: Mailed to me by JDGM ("regular commenter JDGM")Problem:The integers greater than zero are painted such that:• every number is either gold or silver.• both paints are used… Read More
2014-12-28 11:39
Source: Asked to me by a friend - who was asked this question in an interview at FacebookProblem:
Given n points on a 2D plane, find the equation of the line with maximum number of colline… Read More
2014-12-21 11:00
Source: Sent to me by Pritish Kamath (http://www.mit.edu/~pritish/)Problem:
Have you ever played "SET"? You have to play it. http://www.setgame.com/learn_playhttp://www.setgame.com/sites/de… Read More
2014-12-09 15:09
Source: Mind Your Decisions BlogRelated Problem: Expected Length of Last Straw - Breaking the back of a Camel - CSE BlogProblem:
Your boss tells you to bring him a cup of coffee fr… Read More
2014-11-09 13:30
Source: AUSTMS Gazette 35Related Problem: Pebble Placement Puzzle 1Problem: Peggy aims to place pebbles on an n × n chessboard in the following way. She must place each pebble at the c… Read More
2014-11-06 13:27
Source: AUSTMS Gazette 35Problem:
There are several pebbles placed on an n × n chessboard, such that each pebble is inside a square and no two pebbles share the same square.
Perry deci… Read More
2014-10-23 10:37
Source: AUSTMS Puzzle Corner 35Problem:
Call a nine-digit number flawless if it has all the digits from 1 to 9 in some order. An unordered pair of flawless numbers is called harmonious if th… Read More
2014-10-18 10:05
Source: Australian Mathematical Society Gazette Puzzle Corner 34Problem: Begin with n integers x1, . . . , xn around a circle. At each turn, simultaneously replace all of them by the ab… Read More
2014-09-19 08:21
Source: Australian Mathematical Society Gazette Puzzle Corner 35Problem:There are some weights on the two sides of a balance scale. The mass of each weight is an integer number of grams, but… Read More
2014-08-26 09:40
Source: AUSTMS Puzzle Corner 35Problem:
Call a nine-digit number flawless if it has all the digits from 1 to 9 in some order. An unordered pair of flawless numbers is called harmonious if th… Read More
2014-08-11 05:21
Source: Asked to me on quora ( cseblog.quora.com )Problem:
Given an array of n positive numbers (n ~ 100000), what is the algorithmic approach to find the minimum possible sum (>&hell…Read More
2014-08-06 05:07
Source: Puzzle Toad CMUProblem:
You are organizing a conference, with a festive dinner on the first day. The catering service has 1024 different dinner choices they know how to make, ou… Read More
2014-07-10 19:19
Source: Shared by Alok Mittal (Cannan Partners)
Problem:
A 3x3 tic tac toe has 8 "winning lines" (3 horizontal, 3 vertical and 2 diagonals). How many "winning lines" does the 3x3x3… Read More
2014-07-03 15:16
Source: http://nrich.maths.org/Problem:
A mad robot sets off towards the North East on a journey from the point (0,0) in a coordinate system. It travels in stages by moving forward and t… Read More
2014-07-01 11:39
Problem / Observation:
The friendship paradox is the phenomenon first observed by the sociologist Scott L. Feld in 1991 that most people have fewer friends than their friends have, on avera… Read More
2014-06-16 19:08
Source: Puzzle Tweeter who took it from Mind your decisionsProblem: A camel is loaded with straws until it's back breaks. Each straw has a weight uniformly distributed between 0 and 1, ind… Read More
2014-06-16 17:44
Source: Steve Miller's Math RiddlesProblem: A square has a quarter in each corner. You are blindfolded and must get all quarters to be heads up or all to be tails up. You will be told when y… Read More
2014-05-09 07:48
Source: FunctionSpace.orgProblem: Given the polygons P and Q as shown in the grid below, cut P into two polygons P1 and P2 such that, when pasted together differently, they form Q.
Update (… Read More
2014-03-30 12:21
Source: Asked to a friend at Goldman Sachs Quant Interview
Problem:
Estimate the value of pi using a dice
Update: (21 June 2014)
Solution posted by Tushar Makkar, 'My first amat… Read More
2014-02-16 07:22
Source: Cute problem sent by Sudeep KanathProblem: Prove that (2n choose n) is never a perfect power
Update ( 21 June 2014 ):Solution: Posted by Sandeep, Dinesh Krithivasan and Vis… Read More
2006-06-07 11:16
Source: The super awesome puzzle blog by Gowtham Kumar - Puzzle Tweeter - Coin Problem who got it from Wolfram MathematicaProblem:
Suppose you have an infinite sto… Read More
2006-06-07 11:16
Source: Mailed by Sudeep Kamath (EECS PhD Student, UC Berkeley, EE IITB 2008 Alumnus)
Problem:A is a 300 x 300 matrix with 17 on the diagonal, and the rest of the entries being 11. What is… Read More
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