Question

greatest three digit no divisible by 6,8,12

Answer 1

6=2*3
8=2*2*2
12=2*2*3
So the number must be divisible by 8 and the sum of its digits must be divisible by 3.
Greatest 3 digit number=999
By moving backwards constantly by trial and error method we get the following answer:984.

Answer 2

984 is the number.....................!!!!!!!!!!!!!