Find defective Coin

You have 10 heaps of coins each having 10 coins each. A standard coin weighs 10g but one of the heap of coins is defective and it contains all coins weighing 9g. Taking the help of a weighing machine you have to tell which heap contains defective coins. What is the minimum number of times you have to use the machine to tell which of the heaps contains defective coins ?

4 Time

5 Time

3 Time

1 Time

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