Can you duplicate caps in fallout 3 if i am under 10000?

In Fallout 3, you cannot directly duplicate caps, regardless of your caps amount. However, you can exploit certain glitches or use the game’s trading mechanics to effectively "duplicate" items or increase your caps. For instance, by trading items with a merchant while simultaneously selling them back, you can gain more caps than you started with. Just be cautious, as glitches may be patched in certain versions of the game.