posted by kathy .
LCM of 15 c^2b^6, 5c^6b^4, 6c^7b^3
I see the numbers, 15, 5 , and 6, for those the LCM = 30
I see c^2 , c^6, and c^7 , so I need c^7 as LCM
I see b^6, b^4, b^3, so b^6 will do it
looks like 30 c^7 b^6