# Pick a Sack

You have been given $$n$$ sacks having indefinite amount of grains. Except $$1$$ sack every sack has $$10 grams$$ weighted grains, and the $$1$$ exceptional sack has $$9 grams$$ weighted grains. You have been given a weighing machine, in how many minimum number of usage of weighing machine you can identify the sack.

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