can anyone provide the answer for the puzzle below

There are 25 horses,in each race only 5 horses can
participate.how many races are required to select best 5
horses out of 25.

need answer with detailed explanation

Answer Posted / 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

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