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    				| 1. | Using repeated subtracting method find HCF of the following:280 and 420 | 
| Answer» Let m = 420, n = 280 m – n = 420 – 280 = 140 now m = 280, n = 140 m – n = 280 – 140 = 140 now m = n = 140 ∴ HCF is 140 | |