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LCM and HCF

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  1. What will be the HCF of ( 2 x 3 x 7 x 9 ), ( 2 x 3 x 9 x 11 ) and ( 2 x 3 x 4 x 5 )?
    1. 2 x 3 x 7
    2. 2 x 3 x 9
    3. 2 x 3
    4. 2 x 7 x 9 x 11
Correct Option: C

Given factors
2 x 3 x 7 x 9; 2 x 3 x 9 x 11; 2 x 3 x 4 x 5
∴ Required HCF = Product of common prime factors having least powers = 2 x 3


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