Ball Selection

If there are 6681 balls, and among them, one is lighter, then in how many moves that ball can be found?

Questions by sayaleelahoti

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ankita_kri

  • Oct 20th, 2010
 

Balls are 6561/3=2187 +2187+2187>>>>>>1 comparision
2187/3=729+729+729>>>>>1
729/3=243+243+243>>>>1
243/3=81+81+81>>>>1
81/3=27+27+27>>>>1
27/3=9+9+9>>>1
9/3=3+3+3>>1
3/3=1+1+1>1

total==8 comparisons

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