Question 52

The L.C.M. of two different numbers are 30. Which of the following cannot be their H.C.F.?

Solution

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Given LCM of two numbers  is 30
Both numbers should be in the form of 30a and 30b where a and b are co-primes
In the following options 6,10 and 15 are factors of 30 but not 12 and so 12 cannot be the HCF 

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