It is necessary to have elections at regular interval of time because if he/she is not suitable then we can change him. If one will not have elections again and again then the ruling party can also misuse the power.
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It is necessary as:
1. the new govt. formed can get an opportunity to function and servethe people.
2. if the old govt. doesnt  care or serve the people much they can be removed
3.  people's perspective may change from one party to another if the other party functions well.
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