Pick the light sack

You have been given n n sacks with grains having weight of 10 g r a m s 10 grams in each sack except one sack in which grains have weight of 9 g r a m s 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

n / 4 n/4 log n \log n n / 2 n/2 1

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