1.This figure is wrong;please strike it-----(fill in with suitable preposition)

This figure? What is the figure?

Well, you could strike it up, like "Strike Up the Band", or strike it down, like a law that's unconstitutional. What do you think? Maybe use White-out?

1. This figure is wrong; please strike it **out**.

To correct the sentence "This figure is wrong; please strike it," you can use the preposition "through" to indicate the action of striking and removing the figure. The revised sentence would be:

"This figure is wrong; please strike it through."