This is a question I really don't get. I've tried all the things i can think of, and the only clue i have is: Arithmetic Sequences (this is a topic I'm horrible at).

The problem is

Find the sum of all positive integers not greater than 10000 that are divisible by either 3 or 11 but not by both of them.'

Can you please help me soon????

Tkx

Mikhael