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this may be very obvious but my textbook says:
3x(2x-1) and 2x-1
the LCM is 3x(2x-1) , I want to get the logic of this Thanks :)
A Lowest common multiple is the smallest number in which two numbers can both be divided by.
In this situation you have one number (2X-1) and another number which is (3x) times as large.
this means 2x-1 is a factor of 3x(2x-1).
In this case the LCM must be 3x(2x-1) as it is divisible by both.