In the sith base, where you must send three members into the jungle to stop a Sith ritual, you will find a computer console asking you to complete the equation:

(2 _ 6) _ 8 _ 9 _ 1 = 13

To complete the solution, you must input:

(2 * 6) - 8 + 9 * 1 = 13

This will give you the correct answer, and access to the nearby crate.