The HCF of the co-prime numbers 4 and 15 was found using factorisation as 4 = 2 x 2 and 15 = 3 x 5. Since there is no common prime factor, the HCF of 4 and 15 is O. IS this answer correct? Justify your answer.
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When a candle burns, both physical and chemical changes occur. Physical Changes: On heating, candle wax gets melted. Since it again turns into solid wax on cooling. So, the melting of wax and vapourisation of melted wax are physical changes.
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4 = 2 x 2 and 15 = 3 x 5. Since there is no common prime factor, the HCF of 4 and 15 is O. IS this answer correct? Justify your answer.
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