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Ravi repairs appliances by testing hypothesis about the cause of the malfunction based on his experiences with the symptoms. He uses -

[CTET Dec 2018 Paper 2 SST(Hindi - I, English - II),CTET Dec 2018 Paper 2 Math & Science(Hindi - I, English - II),CTET Dec 2018 Paper 2 Math & Science(English - I, Hindi - II)]
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