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Fire is extinguished by:


removing all combustible substance


cutting off supply of air


cooling the burning substance


all of these


Necessary factors required for a combustion reaction to take place are:
1. A combustible or flammable substance. For example wood, petroleum, etc.
2. Ignition temperature. The fuel must be at or above this 'ignition temperature'.
3. A gas that is a supporter of combustion (oxygen). An abundant supply of such a gas is required.
If not a single condition is fulfilled, fire can be extinguished easily.

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