NIMCET 2009 Question Paper with solutions

Question : 95 of 120

Marks: +1, -0

You have 13 balls which all look identical. All the balls are of the same weight except for one. Using only a balance scale, you can find the odd one out with how many minimum number of weighing?

Validate

Solution:

As,

3^{2}<13 ≤ 3^{3}

and further it is not known that ball is lighter or heavier, so, minimum number of weighing required is

3+1=4

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