i got = 29760 & (3,74800) =1

- find ( )

so, ( )

but what shall i do next? 51204-29760 = 21444, it's still a big number.

2. find all n such that = 6.

i really have no idea about this one.

i try where (m.n) = 1 & = m where d|m. but got nothing usefull.

any help will be appreciated.