Category Archives: Interview Puzzles

interview puzzles and brain teasers

Gold Chain Puzzle

Gold Chain interview puzzle This is a good puzzle .It’s a classic puzzle there’s very less probability that you will encounter this puzzle in a technical interview.But there’s a probability that you can encounter some variant of this puzzle in your interview that’s why this puzzle is here. Problem :A man has a gold chain… Read More »

8 Coins puzzle

This is also one of the classic interview puzzle. There’s a high probability that you will encounter this puzzle or some variant of this puzzle in you interview. Problem :There are 8 identical coins.One of these coins is counterfeit and is known to be lighter than the genuine coins. What is the minimum number of… Read More »

Crossing Bridge Interview Puzzle

This is again a classic interview puzzle .Asked by many tech giants. Probably you have heard this puzzle earlier ,but the reason we wrote a post on this puzzle is because many candidates even who have heard this puzzle fail to answer this puzzle in the interview. Here’s the Puzzle : Problem: Four people are… Read More »

Jelly beans Interview Puzzle

Some times problems which look complex are really not that complex. This puzzle is an example of those kind of problems. Problem :you have three jars that are all mislabeled. One contains peanut butter jelly beans(Label :PB), another grape jelly jelly beans(Label : GB), and the third has a mix of both(Label :MIX) (not necessarily… Read More »

Prisoner’s and hats interview puzzle

Prisoner’s and hats interview puzzle This is another interesting interview puzzle asked by many tech companies. Problem :Suppose there are 4 prisoners named W, X, Y, and Z. Prisoner W is standing on one side of a wall, and prisoners X Y and Z are standing on the other side of the wall. Prisoners X,… Read More »

Red and Blue marbles interview puzzle

This is a famous interview puzzle asked by companies .We’ve candidates appearing for Microsoft interviews asked this puzzle may time . Here’s the problem : Problem: you have two jars, 50 red marbles, 50 blue marbles. you need to place all the marbles into the jars such that when you blindly pick one marble out… Read More »

Burning Candles puzzle

This is a famous interview puzzle .I’ve heard many candidates asked this puzzle or some variant of this puzzle in the interview. Problem :You are given two candles of equal size, which can burn for 30 minutes each. You have to measure 45 minutes with these candles. (There is no scale or clock ).There’s no… Read More »

100 doors in a row Interview puzzle

100 doors in a row This is a classic interview puzzle and still asked by many companies. Problem: you have 100 doors in a row that are all initially closed. You make 100 passes by the doors starting with the first door every time. the first time through you visit every door and toggle the… Read More »