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Puzzle Archives :: Interview Puzzles

 Interview Puzzles Practice Set 5

  • 41 / 112

    You've got someone working for you for seven days and a gold bar to pay him. The gold bar is segmented into seven connected pieces. You must give them a piece of gold at the end of every day. What and where are
    the fewest number of cuts to the bar of gold that will allow you to pay
    him 1/7th each day?

    No Best Answer on this question yet!

    Asked In : Capgemini

  • 42 / 112

    You have 10 bags full of coins. In each bag are infinite coins. But one bag is full of forgeries, and you can’t remember which one. But you do know that genuine coins weigh 1 gram, but forgeries weigh 1.1 grams. You have to identify that bag in minimum readings. You are provided with a digital weighing machine.

    No Best Answer on this question yet!

    Asked In : Sapient

  • 43 / 112

    Sand Timers

    You have two sand timers, which can show 4 minutes and 7 minutes respectively. Use both the sand timers(at a time or one after other or any other combination) and measure a time of 9 minutes.

    No Best Answer on this question yet!

    Asked In : Sapient

  • 44 / 112

    Chaos in the bus

    There is a bus with 100 labeled seats (labeled from 1 to 100). There are 100 persons standing in a queue. Persons are also labeled from 1 to 100.

    People board on the bus in sequence from 1 to n. The rule is, if the person ‘i’ boards the bus, he checks if seat ‘i’ is empty. If it is empty, he sits there, else he randomly picks an empty seat and sits there. Given that 1st person picks seat randomly, find the probability that 100th person sits in his place i.e. 100th seat.

    No Best Answer on this question yet!

    Asked In : Cavium Networks

  • 45 / 112

    Madmen in a circle

    N persons are standing in a circle. They are labeled from 1 to N in clockwise order. Every one of them is holding a gun and can shoot a person on his left. Starting from person 1, they starts shooting in order e.g for N=100, person 1 shoots person 2, then person 3 shoots person 4, then person 5 shoots person 6……..then person 99 shoots person 100, then person 1 shoots person 3, then person 5 shoots person 7……and it continues till all are dead except one. What’s the index of that last person?

    No Best Answer on this question yet!

    Asked In : Cavium Networks

  • 46 / 112

    Lazy people need to be smart

    Four glasses are placed on the corners of a square Lazy Susan (a square plate which can rotate about its center). Some of the glasses are upright (up) and some upside-down (down).

    A blindfolded person is seated next to the Lazy Susan and is required to re-arrange the glasses so that they are all up or all down, either arrangement being acceptable (which will be signaled by say ringing of a bell).

    The glasses may be rearranged in turns with the subject to the following rules: Any two glasses may be inspected in one turn and after feeling their orientation the person may reverse the orientation of either, neither or both glasses. After each turn, the Lazy Susan is rotated through a random angle.

    The puzzle is to devise an algorithm which allows the blindfolded person to ensure that all glasses have the same orientation (either up or down) in a finite number of turns. (The algorithm must be deterministic, i.e. non-probabilistic )

    No Best Answer on this question yet!

    Asked In : Alcatel-Lucent

  • 47 / 112

    These kids deserve medals

    There are 10 incredibly smart boys at school: A, B, C, D, E, F, G, H, I and Sam. They run into class laughing at 8:58 am, just two minutes before the playtime ends and are stopped by a stern looking teacher: Mr. Rabbit.

    Mr. Rabbit sees that A, B, C, and D have mud on their faces. He, being a teacher who thinks that his viewpoint is always correct and acts only to enforce rules rather than thinking about the world that should be, lashes out at the poor kids.

    “Silence!”, he shouts. “Nobody will talk. All of you who have mud on your faces, get out of the class!”. The kids look at each other. Each kid could see whether the other kids had mud on their faces, but could not see his own face. Nobody goes out of the class.

    “I said, all of you who have mud on your faces, get out of the class!”

    Still, nobody leaves. After trying 5 more times, the bell rings at 9 and Mr. Rabbit exasperatedly yells: “I can clearly see that at least one of you kids has mud on his face!”.

    The kid's grin, knowing that their ordeal will be over soon. Sure enough, after a few more times bawling of “All of you who have mud on your faces, get out of the class!”, A, B, C, and D walk out of the class.

    Explain how A, B, C, and D knew that they had mud on their faces. What made the kids grin? Everybody knew that there was at least one kid with mud on his face. Support with a logical statement that a kid did not know before Mr. Rabbit’s exasperated yell at 9, but that the kid knew right after it.

    No Best Answer on this question yet!

    Not Yet Asked in Any of the Companies

  • 48 / 112

    All men must die

    One day, an alien comes to Earth. Every day, each alien does one of four things, each with equal probability to:

    (i) Kill himself
    (ii) Do nothing
    (iii) Split himself into two aliens (while killing himself)
    (iv) split himself into three aliens (while killing himself)

    What is the probability that the alien species eventually dies out entirely?

    No Best Answer on this question yet!

    Not Yet Asked in Any of the Companies

  • 49 / 112

    Chameleons go on a date

    On an island live 13 purple, 15 yellow and 17 maroon chameleons. When
    two chameleons of different colors meet, they both change into the third
    color. Is there a sequence of pairwise meetings after which all
    chameleons have the same color?

    No Best Answer on this question yet!

    Asked In : Amazon

  • 50 / 112

    The Man in the Elevator

    A man lives on the tenth floor of a building. Every day he takes the
    elevator to go down to the ground floor to go to work or to go shopping.
    When he returns he takes the elevator to the seventh floor and walks up
    the stairs to reach his apartment on the tenth floor. On a rainy day,
    or if there are other people in the elevator, he goes to his floor
    directly. He hates walking so why does he do it?

    This is probably the best known and most celebrated of all lateral
    thinking puzzles. It is a true classic. Although there are many possible
    solutions which fit the initial conditions, only the canonical answer
    is truly satisfying.

    No Best Answer on this question yet!

    Asked In : Amazon

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