Reasoning (use brain very simple question)

There are 10 pack of cigarette each contains 10 piece cigarette in a pack, each cigarette weight is 1 gram and 1 pack is of 10 gram. But there is 1 pack who's weight is 9 gram (hint- each cigarette weight 0.9 gram). We had taken a weight machine which tell the weight of the pack or cigarette. Tell the minimum number of try (hint- trying to weight the pack or cigarette ) that tell the 9 gram of cigarette pack is placed in which position.     

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