Look below for the two paragraphs :)
I'm guessing this is a question where you have to choose the correct spelling? If so, the answer is immediately. It could also be 'both' if that was an actual option, or it is referring to both of the words given.
I must see you immediately. <-- Correct spelling
I must see you immediatly. <-- Incorrect spelling
Answer:
Select all of them it will be correct
Explanation: