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  • Question
  • Logical puzzle At a restaurant, how could you choose one out of three desserts with equal probability with the help of a coin? What if the coin is biased and the bias is unknown?


  • Correct Answer
  • Our solution: Toss the coin twice Let TH, HT and TT correspond to the three choices And if you get HH, just repeat (so it takes 8/3 tosses on average) BIASED COIN If the coin was biased, TH and HT would occur with equal probability So you could assign THHT, HTTH and THTH to the three choices, with other 4-toss outcomes rejected Or you could assign HTT, THT and TTH to the three choices, with other 3-toss outcomes rejected 


  • Logic Puzzles problems


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    • 1. An office is divided into 8 cubicles. How many of the cubicles are painted if only 1/8 of the cubicles are painted?

    • Options
    • A. 2
    • B. 4
    • C. 8
    • D. 1
    • Discuss
    • 2. If Theresa's daughter is my daughter's mother, what am I to Theresa?

    • Options
    • A. Son-in-law
    • B. Daughter-in-law
    • C. Grand mother
    • D. Grand Daughter
    • Discuss
    • 3. Logical puzzle There are only two barbers in town. One of them has a nice, neatly trimmed head of hair. The other one's hair is a complete mess.Which of the two barbers should you go to and why?
    • Discuss
    • 4. Logical puzzle You have 10 coins?.arrange them in 4 straight lines such that each line contains 4 coins.
    • Discuss
    • 5. 52 C in a P?
    • Discuss
    • 6. 6 B in an O?
    • Discuss
    • 7. Logical puzzle A boy and a girl are talking. "I am a boy" - said the child with black hair. "I am a girl" - said the child with white hair. At least one of them lied. Who is the boy and who is the girl?
    • Discuss
    • 8. Logical puzzle You want to send a secret message to your friend Alex in the mail. But Sam, who you don't trust, has access to all your mail. So you put your message in a box with a lock. But you are not allowed to send a key! How can you get your message through securely?
    • Discuss
    • 9. 18 H on GC?
    • Discuss
    • 10. 19 C in a CB
    • Discuss


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