Okay, let's pretend you're playing with blocks! Imagine you have two blocks in front of you, a red one and a blue one. You also have a rule that says "if two blocks are the same color, then they match." So if you stacked the red block on top of the red block, they'd match because they're the same color.
Now, let's say you want to do some immediate inference. That just means you want to figure out something new using the blocks and the rule you have. Here's an example: you could take away the red block, and then look at the blue block by itself. Since you know that "if two blocks are the same color, then they match," you can make an inference - you can tell that the blue block doesn't match with the red block, because they're different colors.
That's what immediate inference is all about. You start with some information (like the blocks and the rule), and then you look for something new you can figure out based on that information. You don't have to do any complicated math or anything, you just need to think about what you already know and what you can logically assume based on that. It's like building a tower with blocks - you start with a foundation, and then you add on more blocks as you go, always making sure everything fits together in a logical way.