Solution to rank the 25 horses puzzle

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6 Responses

  1. Gagan says:

    can we do better ?
    like with the 7th race can tell the 2nd and the 3rd fastest horses. and then proceeding in similar fashion , we get 24 races
    so , what will be the minimum number of races required ? any ideas ?

  2. Sunil Kumar says:

    How would 7th race give the third fastest. It can only give us the 2nd fastest.. correct??

    @ can we do better ?
    As i found… this was the best possible solution. Please suggest if any.

  3. Gagan says:

    the fastest horse is the winner of the 6th race
    2nd fastest horse is either the 2nd horse in the winners list , or the 1st horse in 2nd fastest’s list

    now 3rd fastest is either the 3rd horse in fastest’s list , or 2nd horse in 2nd fastest’s list , or the 1st horse in 3rd fastest’s list

    H11 H12 H13 H14 H15
    H21 H22 H23 H24 H25
    H31 H32 H33 H34 H35

    so , race H12 H13 H21 H22 H31 and we get 2nd and 3rd fastest horses

  4. Pilot-Pooja says:

    What r the answers..just the answers!

  5. Anonymous says:

    I had been asked this question in my interview. The answer is: 7 races.

    Thanks,
    Sanket

  6. chris says:

    the popular solution is wrong because what if the 5 fastest horses were all included in a single race? then you would not end up with the 5 fastest through this method of elimination.

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