Question : The ratio of the two numbers is 6 : 7 and their HCF is 3. Their LCM is _____.
Option 1: 124
Option 2: 128
Option 3: 122
Option 4: 126
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Correct Answer: 126
Solution : Ratio = 6 : 7 HCF = 3 First number = $6\times 3 = 18$ Second number = $7\times 3 = 21$ So, LCM of 18 and 21 = 3 × 6 × 7 = 126 Hence, the correct answer is 126.
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