- Thread starter
- #1

I got a very basic question...

A number n is dividable by 15 and 18. Can I assume from that that it is dividable by 27?

(dividable - you can divide it by 15 and get no reminder).

If it is dividable by 15, it is by 3 and 5. If by 18, it is dividable by 3 and 6, which means 3 and 2.

Can I say that since not every number that is dividable by 3 is also dividable by 9, this number is not dividable by 27, not necessarily anyway ?