SSC GD 6th March 2019 Shift-3

Question 52

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

Solution

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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