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Question
Find the HCF and LCM:
21, 49, 84
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Solution
| 3 | 21 |
| 7 | 7 |
| 1 |
| 7 | 49 |
| 7 | 7 |
| 1 |
| 2 | 84 |
| 2 | 42 |
| 3 | 21 |
| 7 | 7 |
| 1 |
21 = 3 × 7
49 = 7 × 7
84 = 2 × 2 × 3 × 7
∴ HCF of 21, 49 and 84 = 7
∴ LCM of 21, 49 and 84 = 7 × 3 × 7 × 2 × 2 = 588
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