The space in the others section of iTunes is taking 1.85GB
Even with 10 apps, make sure none of them is containing lots of documents (e.g., an eBook or comic book reader).

Or download iExplorer (free for file system access) and browse through the content of your device.

Also, you can try this:


Connect your device to the computer.
Open iTunes and select it.
Go to the Applications tab.
Scroll down to the Share Files section and.
Select every app one by one and see what documents can be transferred to your computer (you'll be able to check its size).