Answer / anand

GROUP THEM INTO 5 AND RACE,PICK THE 5 WINNERS AND RACE THEM
YOU GET THE FASTEST NOW 6 RACES.
YOU HAVE 24 HORSES LEFT 4 TO CHOOSE GROUP THEM IN 5, IN A
GROUP U WILL HAVE 4 PUT THE FASTEST HORSR AND RACE AND PICK
THE 2 FASTEST OF ITS GROUP AND WINNERS OF THE REST AND RACE
THE 5 HORSES.
SO FOR EACH HORSE U NEED 6 RACES 5 HORSES 30 RACES
ANS 30

Answer / kalyani

my answer is 29.

Answer / a

Initially 5 horses will participate out of 25. therefore
there are remaining 20 horses for the race.
Now from those five, the best 1 is selected.

now excluding the best one, pick one horse from the
remaining 20, and compete with the 4 failed horses.
again we get the best one among them.(20 races take place)

go on repeating the same thing until all the horses have
competed with each other. Thus, in the end you get 15 best
horses. (this means 15 more races have taken place)

Now again 5 horses will participate from those 15 best
horses. the same procedure is repeated, until you get 10
best horses.(20+15+'10' races took place)

now, those 10 best horses will compete with each other to
get 5 horses. (ie 20+15+10+5 races have taken place)

Meanwhile every horse competes with every other horse...
Races taken place are (20+15+10+5)= 50 races

Answer / yogesh hooda

Correct answer is 7.......

dosto bas yehi hai thik answer...ese yahan pe samjhane se
aapko samajh nahi aayega..kafi kuch ulta seedha karna padta
hai...but its true that ans is 7.

Answer / hemanth

All the above answers are wrong.

Race 25 horses in groups of 5, if the top 5 horses were in
group 1, then all information about the 4th and 5th horses
is lost if you consider only the first three rankers of each
group. Dileep, the question is to identify the top 5, not
the top 3, dont go by Jason Mitchell, these interviewers
have also read the book

Answer / vicky

racing 25 horses in groups of 5 n selecting the best among
them is wrong.....because,the remaining four horses in each
group can overtake the one which comes first in the other
groups....
according to me,using probability concept of combinations,it
wil be
25!/(20!*5!)

on simplifying,it will be (25*24*23*22*21)/(5*4*3*2*1)
=6375600/120
=5313

Answer / amit

the answer is 9 races

let the horses be raced as -

race 1 - 1-5
race 2 - 6-10
race 3 - 11-15
race 4 - 16-20
race 5 - 21-25

in race 6, the winners of the 5 racs run, so we get to know
the fastest

the 2nd placed horse from the original race of the winner
can be the 2nd fastest or the 2nd placed horse from race 6
can be the 2nd fastest, so these 2 run in race 7. also for
the 3rd fastest, besides these 2 above horses, the 3rd
placed horse from the original race of the winner can be
the 3rd fastest, the 3rd placed horse from race 6 can be
the 3rd fastest or the 2nd placed horse from the original
race of 2nd finisher in race 6 can be the 3rd fastest. this
gets us the 5 horses which will run in race 7 and we will
get to know the 2nd & 3rd fastest horses

there will be 4 more horses which we will check for being
the 4th fastest, which run the race 8 and 5 more horses
which we check for being the 5th fastest, which run the
race 9 and after race 9, we get the top 5 fastest horses

Answer / maria nirmal raj

41 races
divide races into 21 and 20
1.in the first 21 races eliminate the last one and add new one form the remaining u wil get the best 4 horses
2.now remove the first place horse and add a new horse form the remaining and repeat the 1 step to get the best 4 horses
3.now add the first place horse in best of 4 horses
NOW U HAVE 5 BEST HORSES TO RACE

Answer / karthik.r

5!days needed to select 5 horses form 25horses(each five
combination)
consider a(a1,a2,a3,a4,a5), b(b1,b2,...b5) c
d e are the hourses

'a' alone participate in 5 group of
combination with different combination of 5 hourses(eiter if
it a victor are as a defeat);
In 20 much of horses run in the single
group(because 25 horses are there i am say only 20 horses
remaining 5 hourses are not to repeat).
similarly b,c,d,e horses totaly 120 races

Answer / subi

as per the question we have to divide 25 horses in to 5
group and select one best horse from each group ..so i
think only 5 races will be enough to select 5 best horses
out of 25

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