Bcoz blanket stops d entrance of oxygen which is needed fr d combustion.. Hope I helped u.. Plzz mark as the BRAINLIEST answer..
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When a blanket is wrapped around a person who has caught fire, the blanket cuts off the supply of oxygen for the fire. And without oxygen, the fire cannot sustain itself and thus extinguishes.

So, it is advisable to wrap a person in a woollen blanket when he/she catches fire.
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