Find HCF of the following by listing the factors.
i. 18,21 ii. 27,63
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i) 18 - 1 , 2 , 3 , 6 , 18
21 - 1 , 3 , 7 , 21
So hcf = 3
ii) 27 = 1 , 3 , 9 , 27
63 = 1 , 3 , 9
So hcf = 3×9 = 27
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