Nine balls

Imagine that you have exactly the same appearance nine balls of which one has a greater mass than the other. You have isosceles weights. Post a procedure as you would using a weights to discover heavier balls. How many measurements at least you have to do?

Correct answer:

n =  2

Step-by-step explanation:

$$\begin{gathered} OOOvsOOO\mathrm{\mid }O \\ OvsO\mathrm{\mid }O \\ n=2=2 \end{gathered}$$

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