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1. It is prove that you are citizen of India.
2. It is used to give vote.
3. It is as address prove. 
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Please mark it brainiest answer.......................... 
The three advantages are:

1) it is a reliable form of identification of a person.
2) it is a proof to show that the voter is duly registered.
3) no one else can place a vote in the name of another.

Hope I helped you! :)
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