# Pick the light sack

You have been given $$n$$ sacks with grains having weight of $$10 grams$$ in each sack except one sack in which grains have weight of $$9 grams$$. You have been given a weighing machine for use. In how many minimum number of usage of that weighing machine can you identify the sack.

Note: In each sack there are infinite number of grains

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